The backup concept should be considered as a method to restore data to secondary computing devices or to restore the data based on the fault of a device or user error.

RAID 5 is graceful for tolerance against a single point of failure (the article/response covers this) and allows admins to recover a system when a single drive requires replacement. This should mean hot-swappable drives – power and data connections.

In the event the DATA CENTER is compromised, RAID don’t mean a thing if you can’t take it with you. The article/response starts down this path of “moving data off site”. There will be times when off site is the only option.

Also, a RAID device is not going to allow an admin to recover files deleted by a user.