Last reviewed: October 8, 2026 · 11 min read

How to pick a NAS for family photos and backups (without overbuying)

A NAS (network-attached storage) is a small, always-on box of hard drives on your home network. It can back up every phone and computer in the house and keep decades of photos without a growing monthly cloud bill. It also has more choices than it needs. This guide narrows them down.

Do you need one?

A NAS starts to make sense when your family’s photos and videos pass a few hundred gigabytes, when several people need automatic backups, or when the cloud bill keeps creeping up.

Step 1: How much space

1. Add up what you have now: phone photo libraries (check each phone’s storage settings), computer photo folders and any old external drives.
2. Multiply by about 2 to 3 to leave room for three to five years of growth. Video, especially 4K from phones, grows fastest.
3. Account for redundancy. With two drives mirrored, usable space equals one drive. Two 8 TB drives give you about 8 TB, not 16. (Drives also show a little less than their label, because manufacturers count in decimal terabytes.)

Example: a family with 600 GB of photos today should plan for 1.5 to 2 TB within a few years. A mirrored pair of 4 TB drives is plenty. A pair of 8 TB drives covers computer backups too.

Step 2: How many drive bays

• 2 bays: the right answer for most families. Two drives mirror each other (RAID 1), so if one dies, nothing is lost and you swap in a replacement.
• 4 bays: worth it if you have a large video or media collection, or want to grow by adding drives later. With four drives, you lose only one drive’s worth of space to protection (RAID 5 or similar), or two drives’ worth for extra safety.
• 1 bay: cheap, but a single drive failure loses that copy. Only consider it as a backup target, never as the only home of your photos.

Step 3: RAID is not a backup

Mirroring protects you from one drive dying. It does nothing against accidental deletion, ransomware, theft, fire, a flood or a power surge that kills the whole box. That’s why the classic advice is the 3-2-1 rule:

• 3 copies of anything you care about,
• on 2 different kinds of storage (say, the NAS and a cloud service),
• with 1 copy off-site.

Budget for the off-site copy from day one. Most NAS systems can back themselves up automatically to a cloud storage service, or to a USB drive you swap and keep at a relative’s house. Also turn on snapshots if your NAS supports them. They let you roll a folder back to yesterday, which is a lifesaver after an accidental delete or a ransomware infection.

Step 4: Choosing drives

• Use NAS-rated drives. They’re designed to run 24/7 alongside other drives.
• Prefer CMR drives over SMR. Shingled (SMR) drives can be very slow to rebuild after a drive failure, and some NAS makers advise against them. Manufacturers list the recording technology on spec sheets.
• Check the NAS maker’s compatibility list. Some brands are strict about which drives they support. For example, Synology’s 2025 Plus-series models initially limited third-party drives. With DSM 7.3, Synology again allows unlisted third-party hard drives and SATA SSDs in storage pools, while M.2 NVMe SSDs generally still need to be on the list. Policies change, so read the current one before you buy.
• Buy the size you’ll need in three years, not the cheapest per terabyte today. Upgrading a mirrored pair later means replacing both drives.

Step 5: The specs that matter

• Processor: for file storage and phone backups, almost any current NAS is fine. If you want a media server that converts video on the fly (“transcoding”), or face recognition in photo apps, choose a model with a stronger processor. Intel chips with Quick Sync video handle transcoding efficiently.
• Memory: 2 to 4 GB is fine for backups and file sharing. Choose 8 GB or more, or a model that can be upgraded, if you plan to run containers or several apps.
• Network: standard 1 Gbps Ethernet is fine for backups and photos. 2.5 Gbps helps only if your computer and switch or router also support it and you move big files often.
• Noise and placement: hard drives hum and click. Keep the NAS out of bedrooms, somewhere ventilated, and wired to your router.
• Power: a small UPS (battery backup) protects against sudden shutdowns. Many NAS units can shut down cleanly when the UPS reports a power cut.

Step 6: Software and brands

With a NAS, you’re buying the software as much as the box. Look for automatic phone photo backup, computer backup tools, snapshots, cloud backup, and a track record of security updates.

• Synology and QNAP: the long-established names, with mature software and large app catalogs.
• UGREEN, TerraMaster and Asustor: often more hardware for the money. Compare how polished their software and photo apps feel, and how quickly they ship security updates.
• Do-it-yourself (TrueNAS, Unraid, or similar on your own hardware): the most flexible and often the cheapest, but you’re the support department.

Step 7: Keep it safe

• Don’t expose the admin page to the internet. For remote access, use a private network such as Tailscale rather than port forwarding.
• Turn on automatic security updates and two-factor sign-in.
• Create a separate account for each family member, and don’t use the admin account day to day.
• Test a restore every few months. Pick a random photo and restore it from the off-site copy.

Quick picks by household

• Photos and phone backups for 2 to 4 people: a 2-bay NAS with a mirrored pair of 4 to 8 TB NAS drives. Example: 2-bay NAS · Example: 8 TB NAS-rated CMR drive (buy two)
• Big video library or media server: a 4-bay NAS with a processor that supports hardware transcoding. Example: 4-bay NAS with Intel processor
• For the off-site copy: a large USB drive kept away from home, or a cloud backup plan. Example: 8 TB USB desktop drive
• Battery backup: a small UPS with a USB connection for the NAS. Example: compact UPS with USB