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Google Drive keeps old versions of every file for 30 days. Enough time to recover the plaintext versions.

I recently had to help someone out, and the randsomware was smart enough to be able to mess wit gDrive revisions :/

Not if it's versioned. If you're really afraid of that, just use time machine.

If this happened to me, I think I'd just buy a new SSD and restore from backup.

Dropbox seems to store previous versions of files.