Comparing backup file to hard disk?

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Hi all.

I am looking for a clever way to compare a (monthly) backup file
to the current state of a hard disk.
Aims:
- identify all files that have disappeared on disk
- identify all files whose content has changed on disk

Probably this is more a tar question than a hdup question,
but anyway: here are experts of both worlds :-)

Ciao
Sven

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