Backup applications for OS X
I'm looking for an application I can use to regularly back up some folders from my hard drive to my external hard drive. For now, I just drag + replace the old ones every few days (for example, my entire music folder goes to the hard drive). But this takes quite a while and I was wondering if there's an application that will "sync" the folders so that the external hard drive always mirrors the internal one. It would be even better if I could have it schedule the syncs, so I could have it go while I'm gone or overnight or something. Anything like this? Oh, and I'm willing to use shareware, but I don't want to have to buy something expensive like Retrospect.