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cloud storage guide

Version History Is the Cloud Feature People Ignore Until Ransomware

Sam OkonkwoSam Okonkwo· Security Researcher· Updated October 3, 2025· 10 min read

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Quick take

A synced desktop folder will upload the encrypted junk too. Version history or an offline disk is how you refuse. Proton Drive currently documents versioning in its product story — confirm retention on your plan. Norton-style local suites are a different door. Test a restore.

The folder lied that it was a backup

Sync means both sides match. Ransomware makes both sides match on ciphertext. Matching is the bug.

Version history is a time machine if the vendor keeps it out of the attacker's delete. Read that sentence on the vendor's page, not on a forum.

From the record

A backup you have never restored is a story. A version you cannot roll back is a screenshot of a story.

GUIDEORA rule for cloud versions

Ask two questions

How long are versions kept on my SKU. Can a compromised client wipe them. Then keep one offline copy of the irreplaceable pile anyway.

File version history restoring a document after ransomware
Yesterday is a feature. Only if it cannot be mass-deleted.

Sync

Blast radius

Versions

A maybe-backup

Offline disk

Still king

Test restore

Required

  • Photos and tax PDFs first.
  • Desktop-and-documents sync is a large blast radius — know what you turned on.
  • E2E does not automatically mean immortal versions.
  • Our ransomware piece is the suite-and-disk version of this advice.

Proton Drive as an encrypted sync

Proton Drive currently offers desktop sync and version-related features as they document them. Use it as the private-cloud example, then still confirm version retention. It is not a NAS.

Free 5 GB fills with camera rolls. Plan size is part of the backup story.

Pros

  • +Versions can refuse a sync-ransom
  • +E2E clouds still deserve a retention check
  • +An offline disk remains honest

Cons

  • −People discover versions during the incident
  • −Trash-emptying malware exists
  • −Retention differs by SKU

Restore once while you are calm

Find the version UI today. Proton Drive is the encrypted-sync example. GUIDEORA will not roll back your folder.

Editor take

Match is the bug

Sync copies ransomware. Versions and offline disks refuse it. Proton Drive is the E2E sync example. Confirm retention. Test a restore.

See Proton Drive's current plan