I was wondering about a backup system that both backed up to local storage, but also enable the user to plug in a flash drive (after an inital sync) and have all changes (add/edit/delete) copied to this, which can then be plugged into a computer at a remote site that can then pick up the changes.
Excuse the run on sentence!
I can't quite work out how this would be easily achieved, especially if the two locations can not communicate over the network, but only via the drives.
More thoughts and a flow chart on my blog