I'm signed up for the online back up mainly for peace of mind. But I do want to share my Hurricane Irma experience. I contacted AC support and setup the entire practice on a dedicated laptop with their help. Awesome. Kept it and some fresh backups with me through the hurricane and never worried about not having a patients chart close to hand whether or not we had electricity, internet or whatever. I'm going to keep a backup laptop from now on.
Which version of AC do you have? I'm going to guess that is 9.1 or lower.
In helping another client prep for Irma, I discovered that with newer versions (9.2+ iirc) AC will only allow one database to active, which means a practice can no longer have a backup server credentialed. If you credential a backup server, then the main server becomes useless.
AC has necessitated clients virtualizing in self-defense. Since I can (and have) talked a client on the phone through a CentOS install in less than 30 minutes, they can take ANY computer with the minimal specs, install CentOS, and then launch their VM, or a copy without having to depend on AC to be available to activate the database so they can get into their own data.
It is EXTREMELY handy to have 3-4 copies of your AC server on different drives (still protected by password by the nature of virtualization), with a separate store of your latest .bak and imported items - you are then minutes away from running where YOU want to run your EMR.