Many of the listed &quot;paranoid&quot; backups suffer from a single point of failure: your computer. If your computer gets compromised then it can silently erase&#x2F;cryptolock files on your computer or even on your backup drives in the rare event when they are connected. IMO in practice it could only be feasible with a targeted attack after a thorough investigation of your backup plan (assuming if you don&#x27;t make it public on your blog).<p>I don&#x27;t know crashplan but AFAIK most backup services suffer from the same problem. If you regularly enter or store account credentials for your backup service then it can be stolen from a compromised computer and can be used to delete backups from the past. It can be mitigated if your backup service provides two accounts for the same backup: an &quot;append only&quot; account and an &quot;administrator&quot; account. The idea that a compromise of the &quot;append only&quot; account can&#x27;t delete your past backups.