I've been using Amanda to do my backups at home for over 20 years, but I wasn't aware that file(1) on Linux has a basic parser for the dump file header that shows the first couple of lines?

# file /backup/20220507050001/
/backup/20220507050001/ AMANDA dump file, DATE 20220507050001 sda2 lev 1 comp .gz program /sbin/xfsdump\012ORIGSIZE=3250823\012NATIVE-CRC=00f14f11:3328842656\012CLIE

(It's just plain text with some metadata.)

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