Because I want the backup to start when I mount the drive.
I don't want to leave the drive on waiting for the scheduled backup time.
I've partitioned my disk into a Mac OS X & application partition and a user data (including my home directory) partition. The Mac OS X partition only really needs to be backed up before any updates are done (which I do manually and just in case the updates are a problem). I don't need to do a backup my user partition every day but I may want to backup several days in a row if I've done a lot of work that should be backed up.
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