I have been conned by DropBox. Be very careful.I signed up for a 30 day free trial for one use at £10 per month. At the end I thought the service was ok so agreed to continue. I then got billed £720! I have been fighting with them for a week but they have refused to refund me. They have given me 5 x licenses when I only wanted 1 and told me it is standard practice. What a con. Use them for free if you trust them enough to keep all your data safely but DO NOT sign up to the pro version. You will be conned.