Choose a backup arrangement by what you need to recover: an external drive gives you a directly attached local copy, a NAS can serve several household computers, and a cloud service can keep a copy away from home. If losing both the computer and its local backup would be unacceptable, combine a local copy with a separately stored one. Before relying on any route, check which files or parts of the computer it covers, how older versions are retained and what a restore would require.
If you would need more than documents and photos after replacing a Mac or PC, compare the backup method’s recovery scope before choosing a drive. Microsoft describes File History as a way to restore backed-up files, while Apple says Time Machine can back up Mac apps as well as personal files; neither description means every backup method restores an entire computer setup.
For documents and photos that would be difficult to replace, consider what happens if the computer and a nearby backup are lost together. The National Cyber Security Centre describes a backup as a copy kept in a separate safe location. Check how your chosen service or second destination handles deleted and older file versions too.
A central network destination may be useful when more than one computer needs a local backup. Apple says Time Machine can use a compatible NAS over SMB, while Synology describes ways to back up NAS data elsewhere. This route also brings account, device and backup-task management.
Decide what a successful restore must include, then choose where each copy will live and how you would reach it after a failure.
Choose it when: You want a directly attached local destination for selected files or a supported computer-backup tool.
Trade-off: A drive kept beside the computer can be affected by the same theft or damage.
Choose it when: Several household computers need a shared network backup destination and you can manage its setup.
Trade-off: Synology warns that RAID and drive failures can still cause data loss, so the NAS needs an independent backup.
Choose it when: An off-site copy matters and your connection can support uploads and the restores you might need.
Trade-off: Coverage, version history and offline access depend on the service and its settings.
Choose it when: You need a local recovery route and a separate copy in case the local location is lost.
Trade-off: Both backup jobs and both restore routes need checking.
| Concern | What to check | Who this matters to |
|---|---|---|
| Recovery scope | List the files, apps and settings you would need after a failure; confirm what the backup tool can actually restore. | If replacing my computer means rebuilding more than a few folders, I need to know whether the method covers that fuller setup. About 31% of consumers put recovery scope first. |
| Separate copies and older versions | Check where the other copy is kept and how long deleted or changed files remain recoverable. | I want photos and documents to survive an incident affecting my computer and its nearby storage, and I may need an earlier version. Keeping a separate, recoverable copy comes first for about 31% of consumers. |
| Offline access | Confirm which essential files are stored locally and how a large restore would work without dependable broadband. | When my connection is unavailable, I still need access to important files or a local way to restore them. That need takes priority for about 19% of consumers. |
| Several devices | Check operating-system and network compatibility, capacity for the devices involved and a separate backup for shared storage. | With several computers at home, I need a backup destination I can manage across them rather than a drive moved from desk to desk. Shared-storage management is the main concern for about 19% of consumers. |
Sync or mirroring may not preserve the older file you need after a deletion or unwanted change. Microsoft limits whole-OneDrive restore to eligible Microsoft 365 subscribers and actions within the last 30 days; Backblaze describes a default 30-day history for changed or deleted files.
Check whether your method keeps versions, how long they remain available and how to restore one before relying on the copy.
Synology warns that RAID crashes and drive failures can still result in data loss. Central storage does not, by itself, put a copy beyond an incident affecting the home.
Arrange an independent destination for the NAS data and try restoring a file from it.
That separate destination also needs its own storage and a maintained backup task.
A drive must hold the data your method includes and leave room for the history you want. For Time Machine specifically, Apple recommends a backup disk with at least twice the Mac’s storage capacity and says older backups are deleted when the disk fills.
Compare the computer’s storage, expected growth and desired history with the backup tool’s requirements before choosing capacity.
Microsoft says OneDrive files marked online-only cannot be opened without an internet connection. After a larger loss, retrieving cloud-stored data also depends on the service’s restore method and your access to the account and connection.
Keep files available locally where offline access matters, and check how you would restore the amount of data you could realistically lose.
Windows File History provides a local file-backup route; OneDrive and Microsoft 365 offer cloud file features with account-specific conditions.
Time Machine is Apple’s Mac backup tool for a directly attached disk or a supported network destination.
Synology documents backup tools for compatible NAS systems used as household storage and as part of a multi-destination arrangement.
Seagate’s Toolkit software offers file-backup and mirroring tools with supported Seagate and LaCie drives.
Backblaze Personal Backup is a cloud route for computer data and connected external drives, subject to its service terms.
These Joybuy drives are directly attached storage options for a home computer’s local copy. Choose a backup method separately, check its recovery scope and keep another copy elsewhere if the local location must not be your only safeguard.
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A directly attached local destination to consider for a Mac household backing up files.
This is the 5TB silver variant. Check that its capacity fits the Mac’s data and desired backup history, and confirm the recovery features of the software you intend to use.
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A portable local destination to consider when you need to make a separate copy of computer files.
The listed variant has 4 TB capacity and USB 3.2 Gen 2x2 connectivity. Check your computer’s connection and use a backup method that retains the files and versions your recovery plan requires.
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A local storage option for selected household files when 1TB suits the amount you need to retain.
The title specifies USB 3.2 Gen 2 connectivity. Compare the computer’s used storage and desired backup history with this drive’s capacity, and confirm the backup application you will use.
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A directly attached 2TB drive to consider for a household file-backup routine.
Check the backup software’s version history and recovery scope before relying on it. For a Mac, confirm the exact setup and any driver requirement for this variant before purchase.
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A local drive to consider for copies of documents, photos and other household files.
This is the 4TB black variant. Check the file-system setup for your computer, particularly if it is not running Windows, and choose a backup tool that meets your version-history or recovery needs.
Not automatically. Check whether the service protects only selected folders or everything you would need after computer failure, including any apps and settings you expect to recover. The National Cyber Security Centre distinguishes backing up important files from backing up a computer’s entire contents; Microsoft’s OneDrive recovery features also have subscription and retention conditions.
Do not rely on it as your only copy. Synology warns that RAID crashes and hard-drive failures can still cause data loss. Back up the NAS to an independent destination and check that you can restore from it.
Not if the files require a download to open. Microsoft says OneDrive Files On-Demand items marked online-only cannot be opened without an internet connection. Keep essential files available locally or maintain a separate local copy if offline access matters.
Apple recommends a Time Machine disk with at least twice the Mac’s storage capacity. That recommendation is specific to Time Machine; consider the data you expect to add and the backup history you want to retain when choosing a drive.
Check what data is included, the storage allowance, how long changed or deleted files remain recoverable, account and encryption settings, and how you would complete a large restore. Terms differ: Microsoft says Microsoft 365 Basic provides 100 GB shared across Outlook and OneDrive, while Backblaze describes a default 30-day version history with longer options.