Updating to 5.2 while preserving ATV2 settings

What is the recommended way to update an ATV2 to OS 5.2 (using Seas0npass of course), while retaining all (or most) settings?  For example youtube and other passwords?

Are there files we should retain via SFTP and then restore after the jailbreak? 

(I’m aware of the necessary files for XBMC, I’m talking about just about anything else.)