Hi all!
Yes, we used rsnapshot earlier, but all though it uses rsync (good for partial file changes) it ends up using hardlinks etc on the target and thus consumes quite a bit of space there.
For my local needs (laptop onto a USB vfat drive) I ended up picking Duplicity the other day. But either way we want a solution that transfers only modifications.
I would be happy with a solution that simply keeps an offsite "mirror". Rsnapshot gave us "history" too, and sure, if we can use it then it is probably a good choice. Ken suspected transfers were large, but I am unsure, I hope they are not and that it uses rsync for the actual transfer.
Currently I don't have a proper broadband, but if we set up something that can run "night time" off to people "home computers", then that should be enough I think. The reason we used a server that my former employer had was that it was also a Hetzner box so the connection was really good.
regards, Göran