If the store that you paid to have a back-up of your computer system did not do what it was supposed to do and you ended up losing a bunch of your data, you seem to have a basis for bringing a small claims court action against the vendor seeking the costs of the paid back-up.The problem is the time that you are spending in inputting the data back into the computer may not be subject to compensation for the simple reason that you are incurring it yourself and not paying someone else to input it for you.I would first send a written demand for compensation to the vendor with payment by a certain date and if not paid by then, file your small claims court action.