Backup
A separate, recoverable copy of your data kept to protect against loss, corruption or disaster.
Follow the 3-2-1 rule: three copies of your data, on two different media, with one copy offsite. Tools like Restic, BorgBackup and Duplicati automate encrypted, deduplicated backups. Always test your restores — an untested backup is not a backup.
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Snapshot
A point-in-time, read-only copy of a filesystem or volume that lets you roll back changes instantly.
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.
NAS(Network-Attached Storage)
A dedicated storage device connected to your network that lets multiple devices store and access files centrally.