Rails is not for shared hosting and most VPS and dedicated servers
hosters does not provide any backup. If you ever tried to setup server
backup, you should know how painful it can be. You have to buy additional
backup servers, setup rsync and database backup, and make some automatic
monitoring system for it.

We are lazy (like most programmers) and we decided to automatize
this process. So we thought, if we need useful automatic backup
system for our Rails applications, other Rails teams will need it
too!