Re:Ubuntu One file syncing code Open Sourced
by rahimnathwani on Tuesday August 11, 2015 @10:50PM
(#10045754)
I would still worry without offline backups. Malware or a malicious actor could delete the built-in backups from _all_ sync'ed devices by modifying each file 6 times.
Conveniently, it has a built-in backup system you can enable that keeps the last 'n' copies of files. I've got mine set to 5 so even if something goes horribly wrong, I can fetch from the backup.