Backup of RAID1 partition

Hi all, I have two discs in RAID1 with three partitions on it: hda1(c) - swap hda2(c) - / hda3(c) - /job I will do some experiment with OS, so I should backup / partition (10GB). I have tape device that I big enough for backup of / partition purpose, but what will be the best way to do so? I need backup for bare metal recovery of / partition. dd, star...? Can somebody help me with backup/restore method here? Zoran