Unfortunately Dropbox's revision history isn't reliable enough for a backup. If you notice, their marketing carefully avoids use of the word "backup" despite th

Unfortunately Dropbox's revision history isn't reliable enough for a backup. If you notice, their marketing carefully avoids use of the word "backup" despite the features seemingly implying it. I had a client where a glitch in the Dropbox sync caused 300k+ files to be deleted when we added a new PC. Dropbox support was unable to successfully undo all the file changes, and I had to get a ticket with CS escalated to a special team to get everything restored. Even when it was finished, they could not give a guarantee that every single file deleted was restored. Maybe things got better since they've launched Dropbox Rewind, but given that revision history has been a feature for years and it still didn't work right, I no longer trust them as a backup.