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How to Validate Multi-DVD Backup?

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Using ACTH 2011 Build 6597, I created a backup split into five 4.5 GB .tib files, and copied each file onto its own DVD for archiving.

How do I validate the DVD copy of the backup?

I tried right clicking the .tib file and selecting Archive - Validate.

File #5 validated, but only that file.

File #1 didn't do anything.

File #4 gave a message about not being able to add to the backup list.

Is there a way to validate the entire backup? Some versions of ACT back, it would do all the disks in one validate but apparently that has been improved out of it.

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You may need to copy the DVDs to a hard drive since TI didn't create the DVDs directly.

That's a real shame. Validating the DVDs directly would check not only the backup but also the integrity of the disk.

Too bad this ability was "improved" out of the program.