Backing up IIS7 configuration is as simple as copying the \windows\system32\inetsrv\config directory (and subdirectories) into a backup directory, so you don’t need anything special to do it. Just include this directory in whatever your OS/content back-up plan is, or write a custom script to do it.
To help make managing backups easy, we’ve added a simple cmd-line option to AppCmd.exe that makes management of backup/restore sets easy. For example, to backup configuration, run the follow command:
%windir%\system32\inetsrv\appcmd.exe add backup "My Backup Name"
to restore that backup, run this command:
%windir%\system32\inetsrv\appcmd.exe restore backup "My Backup Name"
to delete a backup, run this command:
%windir%\system32\inetsrv\appcmd.exe delete backup "My Backup Name"
More detail can be found here.