OS X Yosemite 10.10.1 on a Mac Mini Late 2012, 2.5 GHz, 16 GB. Server version 4 (14S333) Running the following services: Caching Calendar Contacts File Sharing Mail Profile Manager Time Machine DNS Open Directory I moved my service data and file shares to an external hard drive. When I format my startup hard drive, reinstall the operating system and server, what do I have to do to connect to the service data on my external hard drive? I imagine that I have to establish user accounts with the same credentials. Really, what I am after is that I'm trying to get Profile Manager to work right with my iOS devices. And I have a wide variety of them (about 12 of them). None of them work. They get a profile installation failure. The research I've done seems to point to just reformat and reinstall. But in doing so, I don't want to lose the service data. Any help you can provide, please...I need reassurance that when I reinstall everything, I'll be able to have access to the data store again. Thank you for your direction.