About this interactive
It is often said that if you do not test your backup, you have no backup. At the least, you cannot rely on a backup until you have tested it: there can be corruption or other problems you need to find before a real disaster does.
Media matters too. Different media have different shelf lives. Cloud storage lasts almost indefinitely, but tape can become corrupted over time.
The only real test is a restore. Restore the backup, then check that what came back is complete and usable.
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