Well, I try to provide a solution for a e-commerce website.
But, on Easter Island, where you need the service is very unstable electricity, but you must have service for local communication as to access the Internet use satellite communications.
However services must be viewed from Europe or the U.S.
Clearly I have local backup service is one thing, I need backup the service, not the applications. That is service availability.
Effectively use backup-manager script to backup my servers.