Well, FWIW, I backup my machine every night via both of Connected Online Backup ($995/yr) and JungleDisk, (about $350 a year to Amazon) and I won't use any of their competitors who can recover their own keys--so the story of enhanced security sells me. (I do trust these vendors not to transmit my password from their client applications to their servers, that's easy; I don't trust them to secure my unencrypted data on lots of machines for decades, that's much harder.)