For my off-site copy, I keep an external hard drive at my parents house and back up to that at least once/month. Time machine handles multiple disk backups beau

For my off-site copy, I keep an external hard drive at my parents house and back up to that at least once/month. Time machine handles multiple disk backups beautifully. Ya, it could be a little out of date, but I wouldn't lose that much in a month.