Originally Posted by EEngr
NAS systems are a bad deal for redundancy. They make a system administrator's job easier. Write one file an everybody automatically gets a copy. But this is a bad deal if that one copy becomes corrupted.
*Redundant Array of Independent (or Inexpensive) Disks
**Some examples are NFS (Network File System), SMBFS (Server Message Block File System), and Novell Netware.
NAS (probably SAN in this case) systems are perfect for redundancy, but redundancy != backup, and the fact people (read ADMINS) keep confusing redundancy, syncing and backup is beyond me.
If one HDD becomes corrupted, the other obviously will, because that's what most of the RAID modes are for, mirroring one disk.
Disaster recovery plans are mandatory, and with that comes a good backup plan, and I'm sure in this case they had one.
Of course I know in real life some lazy ass admins somehow think that RAID is a good "backup", and when the shtf they're sol.