ClaussenDB,   I went ahead and tested the update, and it completed successfully and without losing any of the discovered devices. I do see that the size of the update is small and that it is only addressing a security vulnerability. So it isn't anything that should affect function. I also see that there is a Post Update task that needs to run after the upgrade, could you verify if it completed or is showing it still needs to run it? If so I would suggest running it.    Let me know.    
At first, this post to ask if anyone else is receiving constant Discovery Task notifications after upgrading their DOM appliance to v3.8.4.7. As I started writing, DOM is now unable to see 3/4 of the servers I already had in the system. My guess is that there is an issue with this version, so I am rolling back. Snapshots are your best friend. Anyone else seeing issues after upgrading to 3.8.4.7?
Upgrade to OpenManage Enterprise 3.8.4.7 Problems