I would love to able to sync my database with my .mac account. Yojimbo is capable of this, so it must be possible.
You could use the Backup app, and sync your databases to .mac. I’ve set it up to do it several times a day, and this works nicely!
I’ve used Backup for DTP, but it creates appended files that take up a lot of space. Another way to go is Synchronize! X Plus or Pro from Qdea Software, which allows you either to synch or create an identical backup to external hard drives or network file spaces. <www.qdea.com>