I love/hate Time Machine and would love to switch to something better. The problem is that to be secure, you need both versioned backups and redundant storage of the backup. Time Machine has trouble with network volumes (this doesn't stop me from using my DroboFS but I have to struggle with it regularly). It also doesn't have a cloud backend. Best option to have both is Crashplan, but the UI sucks. So if there's anyone else like me, we're regularly in the market for considering options that offers all of redundancy, version history, and a solid UI.