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What is the best technique to ensure that a backup is always 100% ok?

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I've been surprised a few times when trying to restore a backup and get the warning that the backup had some kind of flaw.
And this even after validation say that the backup is ok.
Currently, with every backup I make (daily, incremental), I force ATI 2018 to do a full validation after the backup is finalized (which consumes HOURS, but I still think it's worth it).
Within the ATI 2018 environment, what would be the best way to ensure that a backup is 100% available for recovery?

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I am not sure that there is any way to guarantee that any backup is 100% available for recovery!

You can continue to do as you are doing, i.e. to force a full validation after every backup is completed.  The issue here is that each backup is then stored on a disk drive or other storage media where that drive or media can deteriorate over time, or be subject to attack by malware etc.

The only real protection is to have multiple copies of your backup data, stored in different places and using different storage media, and to refresh these backups on a regular basis, so that hopefully when one is needed for recovery, all will be well.

See the linked article from Acronis on "The Ultimate Guide to Computer Backup" which has a good / comprehensive write-up on this subject.

Espartano,

A good way to check if a backup is good is to open a tib file Wndows File Explorer by double clicking on the file name.

Doing so effectively mounts the file as a drive so that it can be navigated.  Although this is not a guarantee that a restore of the file will work it is as close as you can get without actually restoring it.

Personally, I do this all the time and I have never had a tib file I could mount not work when recovered.