corrupted tar.gz archive - I lost my backups :)/:(

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Hi,

Before making the move from 7.0 to 8.2, I ran a little script that did a
backup of selected files
and folders.

Trying to recover these files on 8.2, I found that some of the archives -
unfortunately those with
the files that are dear to me - are corrupted.

In other words, I just wanted to ask if there's anyone on here, who knows
of a good repair
utility for corrupted tar.gz archives?

Thanks

pancakeking79