Btrfs/RAID or Backup
RAID or BACKUP?
A common mistake is to confuse RAID with backups. Both have its natural uses and it is important to carefully consider each option.
If you are unsure, the safe suggestion is to ALWAYS USE BACKUPS.
RAID is short for Redundant Array of Independent Disks. The purpose of RAID is to increase fault tolerance against a hardware failure with a physical disk. The exception is RAID0 which utilises two or more disks to increase total total throughput performance.
You would choose a RAID when you need to ensure the continuous up-time of your system. If a disk fails you can replace it with a spare disk at a more convenient time without any data loss.
It is important to note that RAID does not protect user data against filesystem errors, data erasure, user deletions, etc.
Backup used to protect your data in case there is a filesystem error, data corruption, deletions, etc.
The the Btrfs/Backup page for examples of how to manage backups with Btrfs.
- Redundant Array of Independent Disks