NAS vs External Drive vs Cloud: Which Is Best for a Home Office?

For most home offices, use an external drive at your desk plus a cloud backup service for the offsite copy. The drive gives you fast restores; the service, such as Backblaze Computer Backup or IDrive, keeps dated versions of your files somewhere a fire or theft at home can't reach. Add a NAS (network-attached storage, a box of drives on your network) only when several people or computers share the same files. Below is the verdict for four common situations, then the services by name.

Each of these fills one slot in a 3-2-1 plan: three copies, on two kinds of storage, one of them offsite. Our 3-2-1 backup plan for a home office explains the rule and walks through File History, Time Machine and the restore test step by step.

Which should you use? The verdict by situation

Solo freelancer: an external drive plus a backup service

You have one computer and the files are your livelihood. Plug in an external drive and turn on File History or Time Machine, then add a backup service. Backblaze Computer Backup backs up the user data on a computer and its directly connected external drives, so the drive at your desk can be covered too. IDrive Personal does the same and adds phones. Skip the NAS: it adds setup and a second box to maintain, and it still isn't offsite. If you use a work laptop, follow your employer's rules first; the backup guide covers what changes.

Family with photos: one offsite service that covers the phones

Family photos live on phones as much as computers, so pick a service that takes both. IDrive backs up Windows PCs, Macs, iPhones, iPads and Android devices into one account, and keeps up to 30 previous versions of each file. Keep a local copy too, on an external drive or, once the photo library is too big for one computer or several people edit it, on a NAS such as the Synology DS225+.

If the photos move to a NAS, the NAS needs its own offsite copy. Backblaze Computer Backup won't take it (it excludes NAS and network drives), so use Synology's Hyper Backup to C2 Storage, Backblaze B2 Cloud Storage, or IDrive's NAS add-on for Synology and QNAP. Photo sync on the phones, such as iCloud, is convenient, but treat it as sync, not the backup (see below).

Small team: business sync for sharing, business backup for safety

A small team needs two things: one place where everyone edits the same files, and a backup of the computers those files live on. For sharing, use a business sync plan such as Dropbox Standard or OneDrive with work accounts. For the backup, Backblaze Business Backup covers Macs and PCs with an admin console and one year of version history included, and IDrive sells Team and Business plans.

Add a NAS, such as the four-bay Synology DS425+, only if the team works with large files that are slow to sync, or wants files to stay in the office. Then back the NAS up offsite as well. Personal plans are the wrong fit: Microsoft's Windows Backup, for example, doesn't work with work or school accounts.

You only need an offsite copy: a backup service

If you already have a drive at your desk, the missing piece is offsite. A cloud backup service is the easiest way to get it, because it runs on its own. Backblaze Computer Backup suits one computer; IDrive suits several devices or a NAS, and IDrive Express can ship your data on a physical drive if your upload is slow. If you don't want an online account, a second external drive kept in another building also counts, as long as you swap it on a schedule you actually keep.

Cloud backup vs cloud sync: they are not the same

A backup service copies your whole computer's user files on a schedule and keeps earlier versions, so you can go back to last Tuesday's file after a deletion, a bad edit or ransomware. A sync service (OneDrive, Dropbox, iCloud Drive) keeps the same folder current on every device. That is ideal for sharing and working from two machines, but a deletion or a damaged file syncs everywhere too. Sync services do keep a safety net, for a limited time.

For the offsite copy, a backup service is safer. Use sync for sharing, and back up the computers anyway.

The services compared

Every entry below is from the provider's own pages. None of these are affiliate links, and plans change, so read the provider's page before you sign up.

Known problems worth knowing

• Backblaze Computer Backup skips your NAS. Backblaze excludes network-mounted drives, NAS devices and shared volumes, and points NAS owners to B2 instead. Its default version history is 30 days, so an old file you deleted and only miss later may be gone unless you extend it.
• Synology's drive policy on 2025 models. When Synology launched its 2025 Plus models, including the DS225+ and DS425+, full support was limited to Synology's own or certified hard drives, as Tom's Hardware reported. DSM 7.3, released on October 8, 2025, lets those models install and build storage pools on third-party drives that Synology has not validated, but M.2 storage pools and cache still need drives from its compatibility list. Synology still recommends listed drives and gives only limited support for others, so check the list before you buy drives.
• RAID is not a backup. QNAP spells it out: RAID guards against a failed drive, not deletion, corruption or a fire. A two-drive NAS in RAID 1 is still one copy.
• Sync windows are short on personal plans. Thirty days is the norm for Dropbox Basic and Plus, OneDrive and iCloud Drive. If you notice a problem in month two, a sync service won't save you.

External drive vs NAS vs cloud at a glance

Our best external SSDs guide compares four drives by port, speed and encryption, and our best NAS for a home office covers bays, RAID and network ports. A NAS is only as fast as your network, so if most of your devices use Wi-Fi, read Wi-Fi 7 vs Wi-Fi 6 and plan a cable to the NAS.

How we chose

We have not tested these drives, NAS boxes or cloud services, and we have not run our own backup or restore tests. We started from four common home-office situations and matched each to one slot in a 3-2-1 plan. For the services, we read each provider's own plan, feature and support pages for what it backs up, how long it keeps versions and deleted files, and whether it sells personal or business plans; all are linked under Sources. We picked the drive and NAS models from our own specialist guides, and we added the Synology drive policy because it affects which drives you can buy. We don't show prices for drives, NAS boxes or service plans.