Echoing the theme in the last 24 hours of online backup service announcements, US storage company Carbonite has announced that its unlimited storage plan is now available in the UK.

Although unlike BT Digital Vault and Diino, it's not offering a “free storage” option, its backup storage is considerably cheaper than either of those, and it offers unlimited storage capacity. One year subscription costs $50, or $4.16 a month (£2.21), or for 2 years, pay $90, which works out to $3.75 (£1.99) a month.

Carbonite says that over half its users in the US backup more than 20GB of data on its service. The data is double-encrypted for security, and can only be access by the user's own computer. This is unlike the Diino and BT Digital Vault services that offer access from any web portal, which could be an advantage worth the extra cost of the service for some.

Although Carbonite offers unlimited storage, it warns that “the speed of today's DSL and cable Internet services will make it very slow to back up more than, say, 40 to 50GB of data”, and the company reserves the right to deny service to “abusers”.

For a 15-day free trial, visit the website, with the link after the jump. Carbonite's UK website will be up and running at the end of the year, but the service can be purchased through its US site.