RAID Systems Still Need Tape Backups!
It is worth remembering an important point about RAID systems. Even when you use a redundancy scheme like mirroring or RAID 5 or RAID 10, you must still do regular tape backups of your system. There are several reasons for insisting upon this, among them:
RAID does not protect you from multiple disk failures. While one disk is off line for any reason, your disk array is not fully redundant and your data is subject to loss or corruption
Regular tape backups allow you to recover from data loss that is not related to a disk failure. This includes human errors, hardware errors, and software errors.
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