RAID Tips 8 of 10 - Backup Often
Even if your RAID is supposed to be fault tolerant, backup often.
Although the RAID is redundant with respect to hard drive failures, there are still issues that may bring down the entire array, requiring either a restore from a backup or a RAID recovery.
- The RAID controller itself is a single point of failure.
- The failures of the hard drives may be correlated if they have a single root cause (like a power supply failure involving overvoltage).
- Last not least, RAID does not protect you against human error.