I've got what is apparently a slightly uncommon backup requirement:
I have physical access to both disks, and transfer will only ever go one way. I want to completely replicate the first disk to the second, and then update it once a month manually afterward.
I saw this thread: http://stackoverflow.com/questions/15208/whats-the-best-linux-backup-solution, here's where my needs differ.
Both disks are USB, and there is the possibility that their mount locations will change from time to time. I need to be able to specify a source directory (/media/A) and a destination (/media/B) and have A copy to B without simply starting from scratch each time, with the end result being B and A are identical. I don't require time machine-style incremental changes, don't want to tar or encrypt anything, don't need to send this over a network.
Thoughts? I'm running Ubuntu 10.04.