..., a technical question: for large binary files, do you sync the complete file, or is there some smart partial differencing system (e.g. using hashes of 1MB blocks or whatever) to only upload the changed parts of a file?
Because I'd feel the urge to put a TrueCrypt container inside the DataShell folder, and backup that (to make sure I have the data security of client side encryption). But if I make a few small changes within a TrueCrypt volume of 1 GB, will it upload the entire volume, or just the changed parts?
So if you used a TrueCrypt volume it would upload the entire volume each time you made a change and our system keeps a log of up to 30 changes so you could then download which ever version of the TrueCrypt volume you wanted. Perfectly legitimate use of our service so far as we are concerned.
Hope that answers your question.