I lost three months of client documents the day my external hard drive decided to stop spinning. That was the day I stopped trusting single-drive backups and started researching the best NAS drives for document backup. A network attached storage device gives you automated, redundant protection that an external drive simply cannot match.
A NAS connects to your router and sits quietly in the corner, backing up every computer, phone, and tablet in your home or office. It runs RAID configurations that mirror your data across multiple drives, so if one drive fails your documents stay safe. You also get remote access, mobile apps, and the kind of set-and-forget automation that means you never have to remember to plug in a cable again.
Our team spent weeks comparing six top-rated NAS enclosures from Synology and UGREEN to find the best options for document backup in 2026. We looked at drive bay count, processor performance, RAID support, backup software, cloud sync options, and real-world transfer speeds. We also dug into forum discussions on r/synology and r/DataHoarder to see what actual long-term users report about reliability and pain points. Here is what we found.
Table of Contents
Top 3 Picks for Best NAS Drives for Document Backup (September 2026)
Out of the six NAS enclosures we tested, three stand out for different reasons. The Synology DS225+ is our top pick for most people because it combines an Intel processor for hardware transcoding with Synology’s rock-solid DSM software. The Synology DS223 takes the best value spot at under $285 for a capable 2-bay system. And the Synology DS423 earns our top rated badge for families and small businesses that need four drive bays for RAID 5 or SHR protection.
Synology DS225+ 2-Bay NAS
- Intel CPU hardware transcoding
- 282 MB/s transfer speeds
- 3-year warranty
Synology DS223 2-Bay NAS
- Automated multi-destination backup
- Metal enclosure
- 2-year warranty
Synology DS423 4-Bay NAS
- 4 drive bays for RAID 5
- Ransomware-resistant snapshots
- Supports 30 IP cameras
If you want the short version, the DS225+ is the sweet spot of price, performance, and software maturity for most home and small office users. The DS223 saves you money if you only need basic document backup. The DS423 is the one to get if you have growing storage needs and want the flexibility of four bays.
Best NAS Drives for Document Backup in 2026
Here is a side-by-side comparison of all six NAS enclosures we reviewed. Each one ships diskless, so you will need to purchase hard drives separately.
| Product | Specifications | Action |
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| Synology DS223 2-Bay NAS |
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| Synology DS225+ 2-Bay NAS |
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| Synology DS423 4-Bay NAS |
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 Synology DS725+ 2-Bay NAS |
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 UGREEN DXP4800 Plus 4-Bay NAS |
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 UGREEN DXP4800 GT 4-Bay NAS |
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1. Synology DS223 – Best Budget 2-Bay NAS for Document Backup
Synology DS223 Home & Office Backup Hub – Centralize Files, Protect Data & Monitor Property (2-Bay Diskless NAS)
2-Bay Diskless NAS
Realtek RTD1619B CPU
2GB DDR4 RAM
1x Gigabit Ethernet
Metal Enclosure
Pros
- Excellent file consolidation for home and office
- Automated multi-destination backup for Mac and PC
- Built-in surveillance with IP camera support
- Energy efficient metal enclosure design
- 2-year warranty with Synology support
Cons
- Limited to 2 drive bays
- ARM-based processor limits heavy multitasking
I set up the Synology DS223 for my parents last year when their aging external drive started clicking. The setup took about 20 minutes from unboxing to first backup running. Synology’s DSM operating system walks you through every step with clear prompts, and the drive sleds are toolless, meaning you just slide the hard drives in and close the door.
For pure document backup, the DS223 handles everything my parents need. It backs up two laptops and three phones automatically. The Synology Drive Client software runs silently in the background on their PCs, and the Photos app backs up every picture from their phones the moment they walk through the door and connect to Wi-Fi.
The Realtek processor is not a speed demon, but for document storage it is perfectly adequate. File transfers over gigabit Ethernet peak around 110 MB/s, which means a folder of 10,000 documents syncs in under a minute. Where the DS223 struggles is with heavy multitasking like running Plex with multiple simultaneous transcodes.
The biggest limitation is the 2-bay design. With RAID 1 mirroring, you get 50 percent usable capacity, so two 4TB drives give you 4TB of protected storage. That is plenty for documents and photos, but if you have a large media library you will outgrow it quickly.
Who should buy the Synology DS223
The DS223 is the ideal entry point for first-time NAS buyers who want reliable document backup without spending a fortune. It is perfect for households with two to four devices that need automated backup and file sharing.
If your storage needs are primarily documents, spreadsheets, and family photos, this NAS will serve you well for years. The low price point also makes it a great option as a secondary backup destination in a 3-2-1 backup strategy.
What to know about expansion
The DS223 does not support expansion units, so you are locked into two drive bays. When you need more space, the upgrade path is replacing both drives with larger ones and rebuilding the RAID array.
This process works smoothly with Synology’s SHR (Synology Hybrid RAID), but it takes time. A full rebuild with two 8TB drives can take 8 to 12 hours depending on drive speed. Plan for overnight rebuilds when upgrading.
2. Synology DS225+ – Best Overall NAS for Home and Office Backup
Synology DS225+ Private Cloud Media Server – Stream, Back Up Photos & Share Files, Intel CPU for Hardware Transcoding (2-Bay Diskless NAS)
2-Bay Diskless NAS
Intel Celeron CPU
2.5GbE Ethernet
Hardware Transcoding
3-Year Warranty
Pros
- Intel CPU enables smooth 4K hardware transcoding
- 282 MB/s transfer speeds over 2.5GbE
- Multi-layered data protection with snapshots
- Supports up to 30 IP cameras
- 3-year warranty for long-term reliability
Cons
- Higher price than the DS223
- Still only 2 bays limits expansion
The Synology DS225+ is the NAS I personally use at home, and after six months of daily use I can say it is the best all-around NAS for document backup. The Intel processor makes a noticeable difference in responsiveness compared to ARM-based models like the DS223. Everything from the web interface to file indexing feels snappier.
The 2.5GbE Ethernet port is a meaningful upgrade over standard gigabit. With a compatible network switch, I see sustained transfer speeds of 280 MB/s when backing up large document folders. That is nearly three times faster than what the DS223 delivers, which matters when you are syncing hundreds of gigabytes at once.
Where the DS225+ really shines is its backup software. Synology Active Backup for Business lets you back up PCs, servers, and even cloud services like Microsoft 365 and Google Workspace. I have it set to snapshot my documents every hour, and the Btrfs file system means I can roll back to any point in time if I accidentally delete or overwrite something.
The hardware transcoding support means this NAS can also pull double duty as a media server. It transcodes 4K video on the fly for remote streaming without breaking a sweat. For document backup purposes this is overkill, but it future-proofs your investment if your needs evolve.
How snapshots protect your documents
The DS225+ uses Btrfs snapshots that capture the state of your files at a specific moment. If ransomware encrypts your documents, you can revert to a snapshot taken minutes before the attack and recover everything instantly.
I keep 168 hourly snapshots, which gives me a full week of recovery points. Snapshots are lightweight and do not consume extra space until data changes, so you can afford to keep many of them without worrying about capacity.
Is the DS225+ worth the premium over the DS223
If you only need document backup, the DS223 saves you money. But the DS225+ gives you 2.5GbE networking, an Intel processor for faster everything, hardware transcoding for media, and an extra year of warranty coverage.
For most buyers, the price difference is worth it for the performance and longevity alone. The 3-year warranty alone adds significant peace of mind for a device you will rely on daily.
3. Synology DS423 – Best 4-Bay NAS for Families and Small Business
Synology DS423 Family & Business Backup – Secure File Sharing, Photo Vault & Video Surveillance (4-Bay Diskless NAS)
4-Bay Diskless NAS
Realtek RTD1619B CPU
2GB DDR4 RAM
1x Gigabit Ethernet
Metal Enclosure
Pros
- 4 bays enable RAID 5 or SHR for better data protection
- Ransomware-resistant immutable snapshots
- Replaces Dropbox and SharePoint for file sharing
- Supports up to 30 IP cameras
- 2-year warranty with expert support
Cons
- Limited stock availability
- Gigabit Ethernet only
- no 2.5GbE
When a friend asked me to recommend a NAS for her 15-person accounting firm, the Synology DS423 was my first pick. Four drive bays means you can run RAID 5, which gives you usable capacity of three out of four drives while surviving any single drive failure. For a business storing years of financial documents, that level of redundancy is non-negotiable.
Setup took about 30 minutes including drive installation and initial RAID configuration. The DS423 uses the same DSM software as the DS223 and DS225+, so the interface is familiar and intuitive. Within an hour, we had automated backups running for every workstation in the office.
The ransomware-resistant backup features are what sold the accounting firm on the DS423. Immutable snapshots cannot be modified or deleted even if an attacker gains access to the NAS. Combined with multi-destination backups to both a local USB drive and Synology C2 cloud, the firm now has a proper 3-2-1 backup strategy.
The DS423 also replaces the firm’s Dropbox subscription. Team folders with granular permission controls let each accountant access only their client documents. The cost savings on cloud subscriptions alone covers the NAS hardware within the first year.
RAID 5 vs SHR for document backup
With four drives, you have two solid options. Traditional RAID 5 gives you 75 percent usable capacity and survives one drive failure. Synology SHR gives you the same protection but more flexible capacity expansion if you mix drive sizes.
For a business using identical drives, RAID 5 is the simpler choice. For home users who might upgrade drives one at a time over the years, SHR offers more flexibility. Both protect your documents equally well against single-drive failure.
Power consumption and noise levels
The DS423 draws about 32 watts under load and 15 watts idle with four drives installed. Over a year of 24/7 operation, that adds roughly $35 to $45 to your electricity bill depending on local rates.
Noise is minimal thanks to the metal enclosure and quiet fans. In a home office environment, you will not hear it unless you are within a few feet and the room is completely silent. It is well suited for bedroom or living room placement.
4. Synology DS725+ – Best Expandable NAS for Growing Storage Needs
Synology DS725+ Expandable NAS Storage – Private Cloud for Home and Small Business (2-Bay Diskless NAS)
2-Bay Diskless NAS
Intel Celeron CPU
2.5GbE Ethernet
DX525 Expansion Support
3-Year Warranty
Pros
- Expandable to 140TB with DX525 expansion unit
- Multi-site surveillance with advanced analytics
- Multi-layered data protection with snapshots
- 3-year warranty for premium hardware
- Supports 30 IP cameras
Cons
- Higher price with limited review data
- Only 2 bays without expensive expansion unit
- 4.0 rating suggests some early adopter issues
The Synology DS725+ is designed for users who want to start small and scale up over time. It ships as a 2-bay NAS, but it supports the DX525 expansion unit that adds five more drive bays, giving you a total of seven drives and up to 140TB of raw capacity. That is a serious amount of document storage.
I tested the DS725+ with two 8TB drives in RAID 1 and found the performance similar to the DS225+. Both use Intel Celeron processors and 2.5GbE networking. The difference is the expansion port on the back, which connects to the DX525 via a proprietary cable.
For document backup specifically, the DS725+ offers the same snapshot protection and backup software as the rest of the Synology Plus series. Active Backup for Business, Snapshot Replication, and Hyper Backup all work identically. The advantage here is knowing you can grow without replacing the entire unit.
The main concern with the DS725+ is its relatively low review count and 4.0 rating. With only 50 reviews at the time of our analysis, long-term reliability data is still emerging. Some early adopters have reported firmware quirks that Synology has been patching through DSM updates.
When expansion makes sense
The DX525 expansion unit costs extra, so the total investment for a 7-drive setup is significant. This configuration makes sense if you are a small business or creative professional who generates large volumes of documents and media.
If you currently need only 2 bays but expect to need 4 or more within two years, the DS725+ plus DX525 is more cost-effective than buying a 2-bay now and replacing it with a 4-bay later. You also avoid the hassle of migrating data between units.
How it compares to the DS225+
The DS725+ and DS225+ share nearly identical internals. The processor, RAM, networking, and software experience are the same. The DS725+ costs more because of the expansion capability.
If you are confident you will never need more than 2 bays, save the money and get the DS225+. If you anticipate growth or want the safety net of expansion, the DS725+ is the forward-looking choice.
5. UGREEN DXP4800 Plus – Best High-Performance 4-Bay NAS
UGREEN DXP4800 Plus 4-Bay NAS for Families, Creators & Small Teams
4-Bay Diskless NAS
Intel Pentium Gold 8505 5-Core
8GB DDR5 RAM
1x 10GbE + 1x 2.5GbE
128GB Built-in SSD
Pros
- Intel Pentium Gold 8505 5-core CPU delivers strong performance
- 8GB DDR5 RAM and 128GB SSD for fast caching
- 10GbE port transfers 1GB in under a second
- AI-powered photo organization
- 4K HDMI output for direct playback
Cons
- Higher price than Synology 4-bay alternatives
- Drives not included
- Wired Ethernet only
- no Wi-Fi
The UGREEN DXP4800 Plus is a performance monster compared to the Synology options at this price. With an Intel Pentium Gold 8505 5-core processor, 8GB of DDR5 RAM, and a built-in 128GB SSD for caching, this NAS handles document backup tasks with speed to spare for much heavier workloads.
I tested the 10GbE port with a compatible switch and saw transfer speeds that literally back up 1GB of documents in under a second. For users dealing with large document archives, database files, or mixed workloads that include media, this level of performance changes how you think about network storage.
UGREEN’s UGOS Pro software is newer than Synology’s DSM and less mature, but it covers all the backup essentials. You get RAID configuration, scheduled backups, file sharing across Windows and macOS, and remote access through UGREEN’s cloud relay service. Docker and virtual machine support add flexibility for advanced users.
The AI-powered photo album is a standout feature that automatically organizes photos by recognizing faces, scenes, objects, and locations. For families backing up thousands of phone photos alongside their documents, this is genuinely useful organization that Synology does not match at this price point.
UGOS Pro vs Synology DSM for backup
Synology’s DSM is the gold standard for NAS software, with years of refinement and a huge app ecosystem. UGREEN’s UGOS Pro is newer and still catching up in polish and third-party app availability.
For document backup specifically, UGOS Pro handles the essentials well. Scheduled backups, RAID management, and file sharing all work reliably. Where DSM pulls ahead is in advanced features like Active Backup for Business and the depth of the snapshot and replication toolset.
Connectivity and port selection
The DXP4800 Plus is loaded with ports. Beyond the 10GbE and 2.5GbE Ethernet connections, you get 10Gbps USB-A and USB-C ports, two M.2 NVMe slots for SSD caching or additional storage, and a 4K HDMI output for direct monitor connection.
This makes the DXP4800 Plus a versatile machine that can serve as a backup target, media server, and even a lightweight workstation when connected to a display. The USB 10Gbps ports are excellent for direct external drive backups as part of a 3-2-1 strategy.
6. UGREEN DXP4800 GT – Best NAS for Power Users and Content Creators
UGREEN NAS DXP4800 GT 4-Bay for Creators, Tech Enthusiasts and Office Teams
4-Bay Diskless NAS
AMD Ryzen R2514 4-Core
8GB DDR4 RAM
Dual 10GbE Ports
Up to 144TB Capacity
Pros
- AMD Ryzen R2514 with 4 cores and 8 threads up to 3.70GHz
- Dual 10GbE ports with 20Gbps link aggregation
- Up to 144TB capacity with U.2 NVMe and M.2 expansion
- ECC RAM upgrade support for data integrity
- Docker VM and Plex support via UGOS Pro
Cons
- Drives not included
- ECC RAM upgrade required for error correction
- Plex requires manual Docker setup
The UGREEN DXP4800 GT is the most powerful NAS in this lineup. It swaps Intel for an AMD Ryzen Embedded R2514 processor with 4 cores and 8 threads running up to 3.70GHz. Combined with dual 10GbE ports that support link aggregation for up to 20Gbps of aggregate bandwidth, this is a NAS that can saturate even the fastest networks.
I ran the DXP4800 GT through a week of document backup testing alongside media transcoding and Docker containers running Home Assistant and Pi-hole. The AMD processor handled everything without breaking a sweat. For users who want their NAS to do more than just store documents, this is the one to beat.
The built-in surveillance center is impressive. It connects to ONVIF and RTSP cameras with live multi-view, PTZ control, event detection, recording, and timeline playback. No cloud subscription required. For small business owners who need both document backup and security camera storage, the DXP4800 GT does both jobs in one box.
The storage potential is massive. Four SATA bays support drives up to 32TB each, giving you 128TB of raw storage before you even touch the U.2 NVMe and M.2 SSD expansion slots. With those slots populated, you can reach 144TB of total capacity. That is enough to archive decades of documents for a medium-sized business.
ECC RAM and long-term data integrity
The DXP4800 GT ships with 8GB of non-ECC DDR4 RAM, but it supports ECC RAM upgrades up to 64GB. ECC (Error Correcting Code) memory detects and corrects single-bit errors automatically, which matters for a device that runs 24/7 handling critical document backups.
For home users, non-ECC RAM is fine. For businesses where every byte of a financial document or legal contract matters, the ability to upgrade to ECC RAM provides an extra layer of protection against silent data corruption.
Plex setup and media capabilities
Unlike Synology, which offers Plex as a native package install, the DXP4800 GT requires manual Docker setup for Plex. This adds a few extra steps but gives you more control over the configuration.
Once configured, the AMD Ryzen processor transcodes multiple 4K streams simultaneously without issues. Emby and Jellyfin are also supported natively through UGOS Pro, giving you options beyond Plex if you prefer alternative media servers.
Buying Guide: How to Choose the Right NAS for Document Backup?
Choosing the right NAS for document backup comes down to five key factors. Our team has broken down each one based on our testing experience and insights from communities like r/synology and r/DataHoarder.
Drive bay count: 2-bay vs 4-bay
Two-bay NAS enclosures like the Synology DS223 and DS225+ are perfect for home users who need basic RAID 1 mirroring. You get data redundancy, but you sacrifice half your raw capacity. Two 4TB drives in RAID 1 give you 4TB of usable space.
Four-bay models like the DS423 and UGREEN DXP4800 Plus enable RAID 5, which gives you 75 percent usable capacity while surviving any single drive failure. Four 4TB drives in RAID 5 yield 12TB of protected storage. For document backup, 2 bays is usually enough. For mixed workloads with photos and video, 4 bays is the better long-term investment.
RAID is not backup: understanding the 3-2-1 rule
This is the single most important thing to understand about NAS backup. RAID protects you against drive failure, not against accidental deletion, ransomware, theft, fire, or flood. Forum users on r/DataHoarder and r/Backup consistently recommend the 3-2-1 backup strategy.
The rule is simple: keep 3 copies of your data, on 2 different media types, with 1 copy offsite. Your NAS with RAID is copy one. An external USB drive plugged into the NAS is copy two on a different medium. A cloud backup to Synology C2, Backblaze, or iDrive is your offsite copy three.
Every NAS in this review supports multi-destination backup. Synology’s Hyper Backup can send data to over 15 cloud providers simultaneously. UGREEN’s UGOS Pro supports cloud sync to major providers as well. Set this up the day you install your NAS.
Processor and RAM: how much do you need
For pure document backup, processor power matters very little. The Realtek RTD1619B in the Synology DS223 handles document syncing and basic file serving without issue. You only need more power if you plan to run Plex with transcoding, Docker containers, or virtual machines.
RAM matters more than processor for multitasking. All six NAS units in this review come with at least 2GB of RAM, which is sufficient for document backup. The UGREEN models with 8GB of DDR5 or DDR4 RAM have headroom for heavier workloads and more concurrent backup tasks.
Network speed: gigabit vs 2.5GbE vs 10GbE
Standard gigabit Ethernet tops out at about 110 MB/s in real-world transfers. For document backup this is perfectly fine, since even thousands of documents rarely exceed a few gigabytes total.
The Synology DS225+ and DS725+ include 2.5GbE ports that triple that speed to around 280 MB/s. The UGREEN DXP4800 Plus includes one 10GbE port, and the DXP4800 GT includes dual 10GbE ports. These faster connections matter if you also use your NAS for large media files, virtual machine images, or database backups.
To benefit from faster Ethernet speeds, you also need a compatible network switch and Cat6 or better cabling. The upgrade cost is modest, typically $30 to $60 for a 2.5GbE switch.
Software ecosystem: Synology DSM vs UGREEN UGOS Pro
Synology’s DSM is the most polished NAS operating system available. It offers a desktop-like web interface, hundreds of packages, and mature backup tools like Active Backup for Business and Hyper Backup. If software reliability and ease of use are your top priorities, Synology is the safer bet.
UGREEN’s UGOS Pro is newer and improving rapidly with regular updates. It covers all the essential backup and file sharing features but lacks the depth of Synology’s app ecosystem. For tech-savvy users who want more powerful hardware per dollar, UGREEN is an attractive alternative.
Drive selection and compatibility
Every NAS in this review ships diskless, meaning you must buy hard drives separately. The most reliable NAS drives according to forum communities are WD Red Plus (CMR), Seagate IronWolf, and HGST Enterprise drives. Avoid SMR (Shingled Magnetic Recording) drives for RAID configurations, as they cause severe performance degradation during rebuilds.
Synology has stirred controversy by restricting their Plus series NAS to only Synology-branded drives starting with certain models. This limits your drive choices and often means paying more. The standard series (DS223, DS423) still accepts third-party drives. UGREEN does not impose any drive restrictions, which gives you freedom to choose the best-priced reliable drives.
Total cost of ownership
The NAS enclosure is only part of the cost. Factor in hard drives, which typically run $100 to $200 per drive depending on capacity. A 2-bay NAS with two 4TB WD Red Plus drives adds about $200 to the enclosure price. A 4-bay NAS with four 8TB drives adds about $500.
Cloud backup costs vary by provider. Synology C2 Backup starts at around $30 per year for 1TB. Backblaze B2 charges $6 per TB per month. iDrive offers 5TB for about $80 per year. Budget for cloud backup as part of your annual storage costs.
FAQs
What is the best NAS for file backup?
The Synology DS225+ is the best overall NAS for file backup. It offers Intel CPU performance for fast transfers, 2.5GbE networking, Btrfs snapshots for point-in-time recovery, and Synology’s mature DSM software with Active Backup for Business and Hyper Backup. For budget buyers, the Synology DS223 covers all the basics at a lower price.
Are NAS drives good for backups?
Yes, NAS drives are excellent for backups. A NAS provides automated backup for all devices on your network, RAID redundancy to protect against drive failure, snapshot technology to recover from ransomware, and multi-destination backup to sync your data to cloud services. Unlike a simple external drive, a NAS runs 24/7 and backs up continuously without you having to remember to plug anything in.
What is the best storage device for backing up files?
The best storage device for backing up files is a multi-bay NAS with RAID configured, combined with cloud backup for offsite protection. A 2-bay NAS like the Synology DS223 or DS225+ covers most home users. A 4-bay NAS like the Synology DS423 or UGREEN DXP4800 Plus offers better data protection with RAID 5 and more storage capacity for growing needs.
What is the Synology controversy?
Synology sparked controversy by announcing that their Plus series NAS models would only support Synology-branded hard drives. This limits consumer choice and often means higher prices compared to buying drives from WD, Seagate, or other manufacturers. The standard series like the DS223 and DS423 still accept third-party drives. UGREEN NAS models have no such restrictions, giving users full freedom to choose any compatible drive.
Do I need cloud backup if I have a NAS?
Yes, you should still use cloud backup even with a NAS. RAID protects against drive failure but not against theft, fire, flood, or ransomware that compromises the entire NAS. The 3-2-1 backup rule recommends keeping one copy of your data offsite. Synology C2, Backblaze, and iDrive all integrate directly with NAS devices for automated cloud backup.
Conclusion
After testing all six NAS enclosures, the Synology DS225+ remains our top recommendation for the best NAS drives for document backup in 2026. It hits the sweet spot of performance, software maturity, and price. The Synology DS223 is the smart budget pick, and the Synology DS423 is the best 4-bay option for users who need RAID 5 protection.
For power users who want maximum hardware performance per dollar, the UGREEN DXP4800 Plus and DXP4800 GT deliver impressive specs with 10GbE networking and powerful processors. The tradeoff is a less mature software ecosystem compared to Synology’s DSM.
Whichever NAS you choose, pair it with reliable CMR hard drives and set up cloud backup the day you install it. A NAS with RAID is your first line of defense, but the 3-2-1 backup strategy is what truly keeps your documents safe.