Someone made a special patch for rdiff-backup to handle resource forks and whatnot prior to version 0.13.0. I'm pretty sure those were compiled into the DarwinPorts packages because I remember reading it somewhere...

Actually, I just tested this with my DarwinPorts installed rdiff-backup, and NO, IT DOES NOT DO RESOURCE FORKS.

My test was to take a plain bob.html file, copy a new icon to it, verify that a resource fork existed (ls -l bob.html/rsrc), rdiff-backup it up, then restore to another location and the file did not contain the resource fork anymore....

I tried the latest from fink (which turned out to be 0.13.6), but it fails to run with some cryptic errors. Oh well...