Tarsnap encrypts your data before it leaves your machine using keys that no one but you hold. Zumodrive sends data to a remote server, decrypts it then re-encry

Tarsnap encrypts your data before it leaves your machine using keys that no one but you hold. Zumodrive sends data to a remote server, decrypts it then re-encrypts it for storage. That right there seems like a whole world of difference to me (not that I'm really paranoid enough to care, I like Tarsnap for it's other awesome attributes).