1. Create destination location for new store point.  So if you want to move from C:ProgramDataPROServerbackupArchives to E:crashplan, create a new directory on the E drive called crashplan.
2. Copy all data from C:ProgramDataPROServerbackupArchives to E:crashplan
3. In the web admin under Destinations -> Store Points, click the name of the store point and the gear button which appears directly below “Sign Out”
4. Click Edit
5. Change the path name to E:/crashplan (Yes, that is the correct slash)
6. Click Save.

If you do not manually copy the data files, you will receive an error message “The volume label is not present at the new path.  Please move the volume before editing the path.”