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Backup and Sync: What Is the Difference?
Backup and sync do different jobs. Sync keeps files identical across devices, so edits and deletions spread everywhere within seconds. Backup copies files to a separate place and keeps older versions, so you can restore them after a mistake, theft or ransomware. Sync gives you convenience; backup gives you recovery. Most people need both.
| Feature | Sync | Backup |
|---|---|---|
| Main goal | Same files on every device | Recover lost or damaged files |
| Direction | Two-way | One-way (source to backup) |
| When you delete a file | Deleted everywhere | Old copy stays in the backup |
| Ransomware | Encrypted files sync to all devices | Clean older versions can be restored |
| Version history | Short, often 30 days | Longer, set by the backup plan |
| Typical tools | OneDrive, Google Drive, Dropbox, iCloud Drive | Backblaze, Windows Backup, Time Machine, NAS backup jobs |
| Best for | Working across laptop, phone and tablet | Protecting irreplaceable files |
If you searched for Google’s old Backup and Sync app, it was replaced by Google Drive for desktop. Our guide on Google Backup and Sync being gone walks you through the switch.
How Sync Works, and Where It Fails
A sync app watches a folder and mirrors every change to the cloud and your other devices. That is perfect for working on the same document from two computers. It is also the reason sync cannot protect you on its own.
Sync has no idea whether a change is wanted. If you delete a folder by accident, the delete syncs. If ransomware encrypts your files, the encrypted versions sync. If a family member overwrites a spreadsheet, the overwrite syncs.
Providers soften this with a recycle bin and version history. Microsoft, for example, keeps OneDrive file version history for 30 days. That window is useful, but it is short, and restoring hundreds of files one by one is slow.
How Backup Works, and Where It Fails
A backup copies your files to a separate destination on a schedule or continuously. It keeps older versions, so you can restore a file as it was last week or last month.
Backups fail in quieter ways. The job stops after a password change, the drive fills up, or nobody tests a restore.
In my experience, a backup that has never been restored is a hope, not a plan. If yours has stalled, see our guide on a backup stuck and not finishing.
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Row-by-Row: Which Wins for Each Need?
Working across devices
Winner: sync. Edits appear on every device within seconds. A backup is not designed for this.
Recovering from accidental deletion
Winner: backup. Sync recycle bins help for a few weeks. A backup with long version history covers months or years.
Ransomware protection
Winner: backup, ideally one with versions the attacker cannot reach. The US Cybersecurity and Infrastructure Security Agency (CISA) recommends offline, encrypted backups that you test regularly.
Price
Usually a tie. Many people already pay for a sync plan, such as Microsoft 365 or Google One. A computer backup service adds a separate monthly cost. Compare current prices on each provider’s plans page before you buy.
Privacy
Depends on the provider. Both sync and backup services can hold your encryption keys. Some backup tools, such as Backblaze, offer an optional private key. Read our cloud privacy guide before choosing.
When to Choose Each, and How to Combine Them
Use this simple rule: sync the files you work on, and back up everything you cannot replace.
- Keep sync for daily work. Put active documents in OneDrive, Google Drive or Dropbox. See our file sync guide for how this works.
- Add a separate backup. Back up your computer, including the sync folder, to a service or drive that does not mirror deletions.
- Follow the 3-2-1 rule. Keep three copies of your data, on two kinds of storage, with one copy offsite.
- Test a restore. Once a quarter, restore one file and one folder to confirm it works.
Ready to set up the backup half? Start with our pillar guide to back up to the cloud, then compare backup cloud services.
Frequently Asked Questions
Is Google Backup and Sync still available?
No. Google retired the Backup and Sync app and replaced it with Google Drive for desktop. Drive for desktop can both sync your Drive files and back up chosen computer folders to Google Drive or Google Photos. If you still have the old app, uninstall it and install Drive for desktop from Google’s download page.
Can OneDrive or Google Drive replace a backup?
Not fully. They keep a recycle bin and version history, usually for about 30 days, which covers many small mistakes. They still mirror deletions and ransomware damage to every device. For files you cannot replace, add a separate backup with longer version history that sync cannot overwrite.
Should I back up my sync folder too?
Yes. Your sync folder often holds your most important current work. Include it in your computer backup so you have independent versions outside the sync provider. If you use files on demand, make sure the backup tool can read online-only files, or keep important folders set to always stay on the device.
What is the 3-2-1 backup rule?
The 3-2-1 rule means keeping three copies of your data, stored on two different kinds of storage, with one copy kept offsite. For example, keep files on your laptop, an external drive and a cloud backup service. The offsite copy protects you from fire, theft and local ransomware.
Which is cheaper, backup or sync?
It depends on how much data you have. Sync storage is priced by capacity, so large photo or video libraries get expensive. Some computer backup services charge a flat price per computer. Check current pricing on each provider’s plans page, because prices change and vary by country.
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