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How does a ransomware backup protect you?
A ransomware backup protects you by keeping clean, older versions of your files somewhere the malware cannot reach or change. After an attack, you wipe the device and restore files from before the infection. It only works if the backup keeps versions, is isolated from your computer and has a tested restore.
Ransomware encrypts your files and demands payment for the key. Paying is risky and does not guarantee recovery. A good ransomware backup turns the attack into a cleanup job instead of a crisis.
| Backup type | Survives ransomware? | Why |
|---|---|---|
| Sync folder only (Dropbox, OneDrive, Drive) | Partly | Encrypted files sync, but version history may help |
| External drive always plugged in | Often no | Malware can encrypt connected drives |
| External drive unplugged | Yes | Offline, out of reach |
| Versioned cloud backup | Yes, usually | Older versions stay untouched |
| Immutable or locked cloud backup | Yes | Versions cannot be deleted for a set time |
Why ordinary sync is not enough
Sync copies every change instantly, including encryption by ransomware. Within minutes, your cloud folder can fill with locked files. Version history in OneDrive or Dropbox may let you roll back, but only within its retention window.
Microsoft lists ransomware detection and file restore for paid Microsoft 365 plans, and Dropbox offers version history and rewind features. These help, but they are recovery tools inside a sync service, not a separate backup.
What makes a backup ransomware-resistant?
A ransomware-resistant backup has four traits: version history, isolation, strong account security and a tested restore. Missing any one creates a gap that attackers or bad luck can exploit.
Version history
Your backup must keep versions from before the attack. Some ransomware waits days before encrypting. Retention of at least 30 days, and ideally a year, gives you room. Backblaze, for example, offers one-year history free on personal plans.
Isolation
Ransomware cannot encrypt what it cannot reach. CISA recommends offline, encrypted backups because many variants search for and delete connected backups. An unplugged drive or a cloud backup the malware cannot write over gives isolation.
Account security
Attackers who steal your password can delete cloud backups. Turn on two-factor authentication with an app or security key. Our two-factor authentication guide shows how.
Download our free 3-2-1 checklist and tick off each step as you go. It takes about ten minutes to read and covers phones, computers and cloud accounts.
Send me the checklistHow to recover from ransomware with your backup
- Disconnect. Unplug the network cable and turn off Wi-Fi to stop spread.
- Do not reconnect backup drives until the device is clean.
- Report it. In the US, report to the FBI’s IC3 or CISA. Other countries have similar agencies.
- Wipe and reinstall the operating system, or ask a professional to do it.
- Change passwords from a clean device, starting with email and backup accounts.
- Restore from a date before the infection. Restore to a new folder and scan files first.
- Check the files open before deleting anything from the backup.
Our full guide to restore from cloud backup covers restore options for each service.
What ransomware backup means for privacy
Modern ransomware often steals data before encrypting it, then threatens to publish it. A backup restores your files but cannot undo theft. Encryption of the data on your devices and strong account security reduce that risk.
Read our cloud data security hub for the full picture, including who can see your files in the cloud.
Myths about ransomware and backups
- “Macs do not get ransomware.” They are targeted less, not never.
- “My cloud folder is a backup.” Sync spreads encryption. Check version history length.
- “Paying gets my files back.” Not always, and it funds more attacks.
- “Antivirus is enough.” It lowers risk, but backups are your recovery plan.
What to check in a backup provider
Check version history length, whether versions can be deleted from the computer, two-factor support and restore speed. Business plans may offer immutable storage. For home users, long retention plus an offline drive is the practical answer.
Compare providers in our Backblaze review and IDrive review, and follow the 3-2-1 backup rule. Start at the back up to the cloud hub.
Frequently asked questions
Can ransomware infect my cloud backup?
It can damage synced folders, because sync copies encrypted files. A versioned cloud backup usually survives, since older versions stay untouched. The risk rises if attackers steal your account password, so two-factor authentication and long version history are essential parts of the protection.
How far back should my backup go to beat ransomware?
At least 30 days, and ideally one year. Some ransomware stays hidden before encrypting, so a short window may contain only infected copies. Longer retention gives you a clean version from before the infection started.
Is an external hard drive good protection against ransomware?
Yes, if you unplug it after each backup. A drive that stays connected can be encrypted along with your computer. Rotating two drives, with one kept somewhere else, adds protection against fire and theft as well as ransomware.
Should I pay the ransom if I have no backup?
Agencies such as CISA and the FBI advise against paying. Payment does not guarantee you get a working key, and it funds further attacks. Report the incident, ask a recovery professional for help and check whether free decryptors exist for that strain.
Does OneDrive protect against ransomware?
Microsoft lists ransomware detection and file restore for paid Microsoft 365 plans. OneDrive can alert you and help restore your files to an earlier point. Free accounts rely on the 30-day recycle bin and version history, so a separate backup remains wise.
Our Start Here guide shows the three steps every setup needs, in plain English. Cannot find a guide for your phone, app or drive? Request a guide and we will write it.
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