RAID(Redundant Array of Independent Disks)
A method of combining multiple drives so they act as one, improving performance and/or protecting against drive failure.
Common levels include RAID 0 (striping, no redundancy), RAID 1 (mirroring), RAID 5 (single-parity), RAID 6 (double-parity) and RAID 10 (mirrored stripes). RAID protects against hardware failure and improves uptime, but it is not a backup: it won't help against accidental deletion, ransomware or fire. Use our RAID calculator to see usable capacity and fault tolerance.
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NAS(Network-Attached Storage)
A dedicated storage device connected to your network that lets multiple devices store and access files centrally.
ZFS
An advanced filesystem and volume manager offering data integrity, snapshots, compression and software RAID.
Backup
A separate, recoverable copy of your data kept to protect against loss, corruption or disaster.