Duplicate file finder recommendation

I need to sort through several GBytes of some legacy backup files; most are probably duplicates but want to be sure of this before disposing of them.

Any recommendations on a free or inexepensive utility to detect and manage duplicate files? Might be useful also to be able to look for duplicates within a TAR or ZIP file.

(Most of my backups are going to be handled by RSYNC or similar from here on)

Thanks

The command fdupes is available within the Ubutntu repository and here

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