Backup basics

Cloud backup vs cloud sync: is OneDrive, Dropbox or Google Drive a backup?

By EverSafe Team Last updated 24 September 2026 7 min read

On one side two laptops pass the same files back and forth; on the other a vault keeps stacked earlier versions.

In this article (9 sections)

Cloud backup vs cloud sync is one of the most misunderstood questions in keeping files safe. Both put your files "in the cloud", both run quietly in the background, and both let you open a document from another device. But they're built for different jobs. Sync keeps the same files everywhere; backup keeps safe copies you can go back to. When something goes wrong, that difference decides whether you get your files back.

This guide explains how each one works, where sync services such as OneDrive, Dropbox and Google Drive fall short as a backup, what they do well, and how to use sync and backup together.

What cloud sync does

A sync service keeps a folder identical on every device signed in to your account, and in the provider's cloud. Save a file on your laptop and moments later it's on your desktop and your phone. Edit it on one device and the edit appears everywhere.

That's exactly what you want for working across devices and sharing with colleagues. But sync has no idea whether a change is good or bad. It faithfully copies:

edits you meant to make;
files you deleted by mistake;
a spreadsheet saved over with the wrong figures;
files that ransomware has encrypted.

What cloud backup does

A backup service takes copies of your files and keeps them separately from the originals, along with a history of earlier versions. Changes on your PC add new versions to the backup; they don't overwrite the old ones. If you delete a file, the backup keeps it for its retention period so you can bring it back.

The point of a backup is to let you go back in time: to restore a file as it was yesterday, or everything as it was before an attack. It's designed for recovery, not collaboration.

Cloud backup vs cloud sync side by side

	Cloud sync	Cloud backup
Main purpose	The same files on every device; sharing	Getting files back after loss or damage
What it covers	Files inside the sync folder	The folders you choose, often including other drives and open files
You delete a file	Deleted everywhere; recoverable from a recycle bin for a limited time	Kept in the backup for the retention period
A file is damaged or encrypted	The damaged version syncs everywhere	Earlier, undamaged versions stay available
Version history	Usually limited; varies by service and plan	A central feature, with retention you can plan around
Restoring a lot at once	Varies; some services can roll a folder back to an earlier date	Designed for restoring folders or a whole PC to a point in time
Encryption keys	Usually held by the provider	Some services encrypt on your PC with a key only you hold

Where sync falls short as a backup

Deletions spread

Delete a folder on one PC and it disappears from every device. Sync services keep deleted items in a recycle bin for a limited period, so there's often a window to rescue them. But if nobody notices in time, or the recycle bin is emptied, the files are gone.

Ransomware and corruption sync too

Ransomware encrypts the files on your PC, and the sync program dutifully uploads the encrypted versions. Some services can restore a whole folder to an earlier point in time, or keep enough versions to roll back, often only on paid plans and for a limited period. That can save the day, but it depends on noticing quickly and on the exact service and plan you have.

On the left a damaged red file spreads from one laptop to other devices along sync lines; on the right the same file stops at a vault that keeps clean earlier versions. — Sync copies a damaged or encrypted file to every device; a backup keeps the clean versions from before.

Only what's in the sync folder is covered

Sync protects the files inside its folder. Email data files, accounting databases, files on a second drive and anything a program saves in its own location usually sit outside it. Moving everything into a sync folder isn't always practical, especially for very large files or programs that don't cope well with being synced.

Account problems affect every copy

With sync, the "backup" and your working copy live in the same account. If that account is compromised, locked or closed, both are affected. A separate backup, ideally with separate sign-in details, means a single problem can't take out everything.

Sync conflicts occasionally go wrong

When two devices edit the same file while offline, sync services create conflicted copies or pick a winner. Usually that's harmless, but now and then the version you wanted is the one that loses.

What sync services do well

None of this makes sync services bad. They're excellent at what they're designed for:

reaching your files from any device, including your phone;
sharing files and folders and working on them together;
keeping a laptop and a desktop in step;
providing a short-term safety net through recycle bins and version history.

If you use one, find out how long its recycle bin and version history last on your plan, and whether it can restore a whole folder to an earlier date. Then decide whether that's enough on its own, or whether you need a backup as well.

Should you use cloud backup and cloud sync together?

For most people and businesses, yes. Use sync for day-to-day work and sharing, and a backup for recovery. The two complement each other:

Keep your working files in the sync folder as usual.
Point your backup at the sync folder and at everything outside it that matters.
Make sure the files in the sync folder are actually stored on the PC. If your sync service uses online-only placeholders, a backup program on the PC can only copy the files that have been downloaded, so set important folders to always stay on the device.
Add a local copy on an external drive if you want fast restores, following the 3-2-1 backup rule.

Questions to ask before you rely on any cloud service

How long are deleted files kept, and can I change that?
How many earlier versions of each file are kept, and for how long?
Can I restore a whole folder, or a whole PC, to a point in time?
If ransomware encrypted my files tonight, what exactly would I do tomorrow to get clean copies back?
Who holds the encryption keys: the provider, or only me? Our guide to zero-knowledge encryption explains why this matters.
What happens to my data if I stop paying or lose access to the account?

If you've already lost something, our step-by-step guide to recovering deleted files on Windows covers sync recycle bins, backups and recovery tools in the order to try them.

How EverSafe approaches this

EverSafe is a backup service rather than a sync service. It copies the folders you choose on your Windows PC, including open files through Volume Shadow Copy, and keeps version history: hourly versions for the last day, then daily versions, with weekly and monthly versions on plans with unlimited versions. Deleting or changing a file on your PC doesn't delete it from your backup; earlier versions stay available for as long as your plan keeps them, and you can restore any version, bring back deleted files, or restore everything onto a new PC.

Files are encrypted on your PC before upload with a key derived from your own password, and if EverSafe detects suspicious mass changes it automatically protects your last clean backup for 30 days. It sits happily alongside OneDrive, Dropbox or Google Drive. See how EverSafe works.

Frequently asked questions

Is OneDrive a backup?

OneDrive is mainly a sync service. It keeps your files in step across devices and in Microsoft's cloud, and its recycle bin and version history can rescue recent mistakes. But deletions, overwrites and encrypted files sync too, so on its own it isn't a complete backup. Use it alongside a backup that keeps independent versions.

Is Google Drive a backup?

The same principle applies. Google Drive syncs and stores files and offers a bin and version history for a limited time. That's useful, but it isn't a substitute for an independent, versioned backup of your PC.

Does Dropbox keep deleted files?

Dropbox, like most sync services, keeps deleted files and earlier versions for a period that depends on your plan. Check the details for your plan, and don't rely on it as your only way to recover files.

What happens to synced files if ransomware infects my PC?

The sync program will usually upload the encrypted files, replacing the good copies in the cloud. Some services can roll a folder back to an earlier point or restore previous versions, within limits. A separate backup that keeps versions from before the attack, and that malware on the PC can't change, is the dependable way back.

Can I back up my OneDrive or Dropbox folder with a backup service?

Yes, as long as the files are actually stored on your PC. If online-only files are switched on, set the folders you want backed up to always stay on the device so the backup program can read them.

Written by the EverSafe Team. First published 24 September 2026; last updated 24 September 2026. This guide is general information, not legal or professional advice.