Comment on ChronoSync

Awesome app. It covers the full range from basic backups to very complex rule-based 2-way syncs.

Also, full support for bundle files (or file bundles), such as Pages, Keynote, Numbers files or the dreaded iPhoto '08 library. Although I haven't had the opportunity to try it, the manual says ChronoSync is able to look into bundles and only sync or backup what's changed in it. This means you won't have to refresh the whole backed-up copy of your library after only adding one pic.

Truly has it all, highly recommended. Only minus, as mentioned before me: aesthetically it really needs some work on the UI and icon. Still functional, though.