Duke,
I simply back up my AC daily onto a thumbdrive (be sure to open the programs on your C drive and send AC to the thumb drive). I then take the thumbdrive home and load it into my computer at home. This works great; I use the AC for a reference for patient calls at home only. I do not add to it or download it back to my office computer.
Secondarily, I also use an HP Pocketdrive external hard drive for a backup at the clinic, but I leave it in a locked drawer at work.
When I go out of town, I download my AC via thumbdrive to my travel laptop.
Jim