A home NAS is a small computer that serves storage over your local network. It makes sense when several devices need the same files or backups. An external drive is simpler when one computer needs storage. Before buying a NAS, decide which data it will hold, how much usable space you need, and where a second copy will live.
Decide what you need the NAS to do
Write down the devices that need access and what they will do. A family might want one location for photos and laptop backups. A video editor might want a shared archive while keeping active projects on a fast internal drive. These workflows put different demands on networking, storage, and access. Estimate your largest common file and the number of people who might use the NAS at once.
If only one computer needs a backup, compare the cost and maintenance of a NAS with the options in our external drive comparison. An external drive can be connected directly and stored separately after use. A NAS offers a central destination that computers can reach without swapping cables, but it also needs network access, updates, and an account setup you can recover.
Decide which computer currently owns the original. If you move all photos to the NAS and delete the originals from your laptop, the NAS becomes the primary location. The old laptop backup will stop protecting new photos stored there. Add the NAS folders to a separate backup plan before moving the only working copies.
Estimate usable capacity and drive bays
Measure your existing data and make a rough estimate of growth. Include retained file versions and backups from other computers. Then check usable capacity in the proposed storage layout. Two drives advertised at the same size do not necessarily give you twice that usable space. In a typical two-drive mirror, each drive holds a copy of the data and usable capacity is roughly that of one drive before formatting overhead.
A mirror can keep the storage available after one drive fails, depending on the system and failure. It does not protect against accidental deletion, theft, or damage to the entire unit. See Synology’s NAS buying guide for examples of how bay count and RAID layout affect capacity. Use the vendor’s own documentation for the specific enclosure and software you plan to use.
Check what it costs to expand. A two-bay unit may require replacing both drives to increase mirrored capacity. A larger enclosure can offer more options but costs more upfront and may use more space. Check the supported drive list, whether drives are included, and whether adding or replacing drives requires a migration procedure. Price the enclosure, drives, and separate backup destination together.
Test the network and set up accounts
Connect the NAS to a suitable Ethernet port on your router or switch. Even if laptops use Wi-Fi, a wired NAS makes the storage side of the network easier to test. Start by transferring a large sample file from a wired computer if available. Repeat from the desk where you normally work. If the latter result is slower, review the wireless path using our Ethernet backhaul guide before assuming the NAS disks are the issue.
When several users need access, give each person an account and access to the folders they need. A shared photo folder may have different write permissions from a folder holding computer backups. Test with an ordinary user account before copying important files. Check whether the person can open and add the right files and whether unrelated folders are hidden or inaccessible as intended.
Start with local access. If you later need remote access, use the vendor’s documented options and review account protection, software updates, and permissions before exposing anything. Document how to recover the administrator account and where to find the storage encryption key if you use encryption. Store that information securely in a place you can reach even if the NAS is unavailable.
Plan a separate backup and restore a sample
Pick a destination independent of the NAS, such as a removable drive or an offsite service you can recover from. Start with a few representative files. Back them up, restore them to a different folder, and open them. Our home backup restore guide gives a repeatable process. If the NAS makes snapshots, confirm which folders are covered and how long versions are retained. Snapshots on the same unit are useful for some errors, while a separate destination helps if the unit is unavailable.
Check the backup plan from another device. Can you find the instructions, reach the destination, and restore a file without logging into the NAS? Include photos, office files, and any application that needs more than one folder to rebuild its library. If your backup destination is encrypted, confirm the recovery information works and keep it separate from the drive and enclosure.
Keep a short checklist for the next drive replacement or software update. Record which disk bays contain which drives, the storage layout, the source folders, the backup destination, and the last successful restore date. Review the logs after the first week and again after moving important folders. A reliable setup should tell you when a job fails and give you a way to recover without relying on memory.
Measure your normal workflow before deciding the project is finished. Copy a folder with large and small files, open it from another computer, and try restoring an earlier version if your backup tool supports that. If you work with large media, also compare editing across the network with working from a local copy. Keep the arrangement that gives you the access and recovery time you actually need.
As an example, suppose you have 1.5 TB of photos and documents and expect to add roughly 500 GB over the next few years. A mirror built with two 2 TB drives leaves little space for formatting overhead, backup history, and growth. Price a larger mirrored configuration against a single external drive plus an independent backup. If your family wants easy shared access and automatic laptop backups, the NAS may justify the extra cost. If you only need an occasional copy of one laptop, test a direct drive first. Include room for versions because a backup that retains older files may grow faster than the original folder.
Frequently asked questions
Is a NAS the same as an external hard drive?
A NAS serves files over the network. An external drive usually connects directly to one computer. Both can serve as backup destinations when used in an appropriate plan.
Is RAID a backup?
RAID can improve availability after a drive failure. Keep an independent backup to recover from deletions, damage to the enclosure, or other losses affecting the whole unit.
Does every home need a NAS?
A NAS is useful when several computers share files or backup space. A direct external drive may be enough for one computer.
Can I start with a two-bay NAS?
Yes, if its usable capacity and expansion options fit your data. Check what it takes to grow the storage before buying.
