For our VPS servers we make daily backups with 7 days of retention and 1 month of archived backups. This means we make a backup every day and will always have a backup for the previous 7 days. We also will always have a backup of 1 month age at anytime, given you have been on the server for atleast 30 days.

For our servers you can purchase R1Soft backup space additionally with your server: http://soladrive.com/r1soft_backup.html