I already cloned my launch Deck onto a external hard drive with Clonezilla a few days ago. Realized i didn’t have the correct size torx screwdriver, so i had to wait a few days to get one. I’m going to open up the OLED to put in a 2 tb SSD, and then use Clonezilla to install my Deck image. Should be no problems, right? Firmware was updated a few days ago, so it’s up to date. I think it was 3.5.5 or something.
SteamOS does that automatically. You don’t need to do that manually.