Time Machine or folder sync: which one do you need?
By Kayabyte · Last updated 13 November 2026
Short answer: Time Machine keeps the history of your whole Mac so you can go back to how a file looked last week. A folder sync makes one folder match another, so you can open the copy anywhere without Time Machine. They answer different questions, and many people use both. Use Time Machine for “my Mac, with history”. Use a folder sync such as Pairfold for “this folder on that drive or NAS, as plain files”.
Side by side
| Time Machine | Folder sync (mirror) | Folder sync (two-way) | |
|---|---|---|---|
| What it protects | The whole Mac | Folders you pick | Folders you pick |
| Keeps older versions | Yes | Only if the tool archives them (Pairfold archives replaced and removed files) | Same |
| Copy readable without a special tool | Browse through Time Machine | Plain files in Finder | Plain files in Finder |
| A deleted file | Stays in older backups | Removed from the copy, or archived | Removed on the other side, or archived |
| Good against | Disk failure, mistakes, a lost Mac | Disk failure, a second copy of one folder | Working on two places |
What Time Machine does
It backs up to a disk or network destination you pick, hourly while it is connected, and lets you restore a file or the whole Mac. You can exclude folders but you cannot back up a single folder on its own. The backup lives in a form Finder shows through Time Machine, not as a plain folder you drag from.
What a folder sync does
It copies files so that two folders match. That is a copy, not a history. If you delete or overwrite a file and sync again, the copy follows. Pairfold reduces that risk: the files it replaces or removes go to a dated archive folder, and a run that would change a large share of files waits for your confirmation. The archive is a folder you open in Finder, not a version browser, and not a substitute for Time Machine’s history.
Which to use
- Whole Mac, protect against mistakes and a dead disk: Time Machine.
- A project, photo or music folder on an external drive or NAS, readable on any computer: folder sync, Mirror mode.
- A working folder on a Mac and a drive you carry: Two-way, see two-way sync with an external drive.
- Anything you cannot lose: Time Machine and a second copy elsewhere. A sync is not a complete backup plan, ours included.
With Pairfold
Pairfold does not replace Time Machine. It makes a plain, checked copy of the folders you choose, with a preview of every change, on a schedule or when a drive connects. It is not a bootable clone and has no version browser. macOS 26 or later.
Steps with Pairfold
- Keep Time Machine running for the whole Mac.
- In Pairfold click New Pair and choose a folder and a folder on a drive or share.
- Choose Mirror, Check and Preview, then Sync.
- Set a schedule in the pair’s settings.
Get Pairfold: see the app page for where to get it
Questions
Is a mirrored folder a backup? It is a second copy. It protects against disk failure. It does not protect against a mistake you then mirror, unless the tool archives replaced files, as Pairfold does.
Can I use both? Yes, and it is a sensible setup.
Can Time Machine back up just one folder? Not by choosing it alone.
Related guides
- How do you mirror a folder without deleting files?
- How do you back up a folder to a NAS on a Mac?
- How do you sync two folders on a Mac?
Apple, Mac, macOS, Finder, Time Machine and iCloud are trademarks of Apple Inc. Pairfold is made by Kayabyte and is not affiliated with or endorsed by Apple.
More guides
- What is the best folder sync app for Mac?
- Carbon Copy Cloner or SuperDuper alternative: do you need a clone or a folder sync?
- Why do files copy again to an exFAT or FAT32 drive on a Mac?
- Pairfold vs Sync Folders Pro, ChronoSync and FreeFileSync
- How do you use rsync on a Mac to back up a folder?
- How do you sync a folder to an external drive automatically on a Mac?
- How do you run a folder sync when a drive is plugged in on a Mac?