I think a modifier for filter rules that inhibits the --backup option
for the particular line might be useful.

for example I could have
--filter='H,nb /.mozilla/firefox/xxxxx.default/Cache'

or I could have

--filter'+ /Documents'
--filter'+,nb /.mozilla'

(So my documents will be backed up to --backup-dir but my firefox
profile will not)
Please use reply-all for most replies to avoid omitting the mailing list.
To unsubscribe or change options: https://lists.samba.org/mailman/listinfo/rsync
Before posting, read: http://www.catb.org/~esr/faqs/smart-questions.html