It appears that a lot of people are having a similar issue when trying to upgrade from 4.0 to 4.5. I have been working on this thing for 12 hours and since I have not been the ePO admin for more than about a week I am learning as I go. One question I had is what are the folders needed to be able to just uninstall and reinstall ePO altogether and then once ePO is up and running, restore all of my policies, tasks, systems, and all of that god stuff? Or is that possible? Thanks in advance.
Please look at the link below.
That KB article discribs the ePO 4.5 server backup and disaster recovery procedure