@Charlie Clark Re: Don't shoot the messenger!
Does it work offline?
Yes, and selecting what is and isn't can be configured on a per-file and per-machine basis
Can you mount it as a file system and, therefore, encrypt it yourself?
Not directly, but you can create one or more VHD files and store them on there and mount them on your machine and use whatever file system you want.
Biting the hand that feeds IT
