Most servers that we operate have mirrored raid drives for continuous protection. This means that in the event of a hard drive failure, the drives can rapidly be swapped with little interruption of service to you.
That being said, 24-7 Webs Inc. does automatic back up of all sites on a nightly basis. The backup is retained for 1 day until the next daily backup. Once per week a backup is taken and retained until the next weekly backup. Once per month a backup is taken and retained until the next monthly backup. All backups are stored on storage facilities separate from the production storage on the server.
Once per month a backup is taken of all active sites and stored off-site. These are retained for 6 months, so there are, at any one time, up to 9 backups available to our customers. Restoring backups from off-site does cost extra.
In the case of cancelled accounts, the backup off-site data is retained for up to 3 years at our discretion.