Here is a script that I wrote last night to demonstrate how you can implement a simple MP backup process. The goal is to allow you to backup unsealed MPs so that if you make a mistake you can go back to the good copy. You can also schedule this script to run on a daily basis using Task Scheduler.
Here is how you can run the script from the command line:
powershell.exe C:\BackupMPs.ps1 -rmsName:'rms.contoso.com' -folderName:'c:\Backups'