NAS provides storage
A NAS makes storage available over a network. Its usefulness depends on permissions, capacity, updates and the applications using it. Storing company files centrally can simplify access, but it also creates a resource whose failure or compromise needs planning.
RAID addresses specific disk failures
Some RAID configurations tolerate certain disk failures, while others do not. RAID does not undo accidental deletion, ransomware or damage to the entire device. Rebuilds also carry operational risks and should follow the manufacturer's guidance.
Keep independent recoverable copies
Use an appropriate backup plan with separate copies and access controls. Test restores of representative data, including permissions where needed. Before replacing disks or rebuilding an array, confirm the device state and backup availability rather than acting on a warning light alone.
Sources and further reading
Options vary by product version, subscription and organisation policy. Refer to the vendor documentation before making changes.
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