It is very cheap. You only pay for the amount of total storage you are using at the end of each month, at 15 pence per 100 megabytes per month, with a minimum charge of 50p per month on each domain name. How many megabytes of storage you use depends mostly on how many large attachments you receive (e.g. if you receive a lot of photos). If you received 20 large, high-quality photos every week and as a result used 100 additional megabytes each month, then in your first year you would spend a total of £11.70. If you do not receive many large attachments, then you could go for a few years only paying 50p each month. Your first invoice will be £6 to cover the first year in advance, and then any extra charges will be invoiced in arrears.
Posted in: Questions about e-mail backup