It was Eilert Sundt who got the ball rolling on this but I don't know if it still exists in any form.
Eilert's web page is at http://www.eilert.no/English/
I tried to contact him several times on Skype, but he didn't answer. One note of interest is that he claims to be the northern most FileMaker developer... most interesting claim!
And the backup developer's project was called FM Plan B or www.fmplanb.org, but it doesn't seem to be working anymore.
You can always create your own group and take the steps to protect your client via a letter to a lawyer with account name and password, etc.
fmplanb.org sounds like what I was remembering.
Too bad it's defunct!
These days with most folks having tons of bandwidth, having offsite backups is easy, but having someone qualified to install and set up & run the database is still a specialty skill.