LaCie wrote this free backup app called SilverKeeper a long time ago, and I quite liked it, but I had a hard time counting on it. It seemed like they weren’t serious about it. But they recently updated it to be a fully OS X Leopard-compatible, universal binary app. I’m testing it out now on a network volume, and will update this post with my findings.
Update: So far so good. I have SilverKeeper installed at a couple of environments, and it appears to be reliable and unobtrusive.