We have Windows NT 4.0 SP6A and Exchange 5.5. We think we have a bad hard drive. Exchange is running but to be safe we would like to get it onto a new drive. So my question is what should we back up? My guess is the directory and the Information Store. And how do we import all the information etc... after the re-install, to make it work like it was? Any help would be greatly appreciated. We also thought about just "Mirroring" the drive and then breaking the mirror. Thanks in advance.