LVM has RAID 5 and 6
built-in. You can also create LVM physical volumes on top of software or hardware RAID devices.
RAID is not the same as a backup, though. It's a high-availability solution: When a disk breaks, the RAID continues running. It doesn't help you when you delete a file by accident.
Snapshots are the opposite: They help when you lose a file, but they don't protect you in the case of disk failures.
