321 rule for backups: 3 copies, 2 different media, at least 1 off site Something is not a backup if you haven't tested that you can restore from it. All backu

321 rule for backups: 3 copies, 2 different media, at least 1 off site Something is not a backup if you haven't tested that you can restore from it. All backups not in your direct physical possession should be encrypted before being written.