I am planning on implementing a Group Policy backup for our environments using the script on the attached page (with some edits for our environment). One thing we are not sure of is how long of a retention policy we should maintain and how often we should back up.
http://blogs.msdn.com/b/canberrapfe/archive/2012/04/10/backing-up-gpos-with-a-powershell-script.aspx
One though is to back up on Friday nights and keep 4 backups for 30 days worth. Does anyone have a better recommendation than this?