Three copies
Keep the original plus two additional copies so one failure does not remove every recovery option.
Two types of storage
For example, internal storage plus an external drive or remote storage.
One copy off-site
Theft, power damage or ransomware can affect everything connected in one place. A separate copy reduces that risk.
Automate and verify
Automatic backups are useful, but occasionally test that they are actually running and that files can be restored.
Prioritise irreplaceable data
Work documents, photos, databases and critical settings should be protected first.
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