Remote home backup server

mjh2901 writes: "AFter recently setting up a good backup server at home, I realized if the house goes so do my backups. I have a relative a few hours away. Far enough to not be affected by any natural disasters or manmade disasters that would destroy my homestead yet close enough to drive up and back in day. My relative has cheap home DSL, which I have setup with a cheap little router to protect grandma from the outside world and provide remote support. My backup plan is to toss an old computer with a big Hard drive to mirror my backup server to. The initial backup can be done at my house before installation in order to avoid trying to send 300 gigs over the net. Once that is done what is the best way/tools to keep my home backup server mirrored to the backup server at grandmas. Preferably something that knows to run during the day or late at night when we both are not using our net connections."