rdiff-backup and APT-Pinning

I ran into a problem yesterday. Having upgraded Lobsang to the soon-to-be-released Jaunty, my server, running 8.10 failed to backup my desktop machine using rdiff-backup. It looks like it is caused by a conflict between the two versions of rdiff-backup.

Thanks to a comment from Defenestration I think something called APT-Pinning might be a good solution where you have multiple versions of Ubuntu. So here’s a question for all you Ubunteros out there:

Would APT-Pinning be a good solution here? If yes, which way round:

* Pin rdiff-backup to the oldest version in your network,
* or run the latest rdiff on the older Ubuntu releases?

Am looking forward to your responses.