I know this is not what this ticket is asking for, but deja-dup 42.1 and up will exclude any folders with a CACHEDIR.TAG or .deja-dup-ignore file in them.
I know this is not what this ticket is asking for, but deja-dup 42.1 and up will exclude any folders with a CACHEDIR.TAG or .deja-dup-ignore file in them.