Pi4, booting from a 2TB USB drive attached.
I've finally got the system the way I want it and I'd like to be able to make an SD card image from it so I can quickly recover when I screw it up. Total space used on disk is around 16GB, so it'll fit onto a card easily.
I know I could just buy another drive and clone it, but I've got a drawer full of SD cards I'd like to use.
Just using the SD copier and dd hasn't worked (I suspect it's trying to copy the entire 2TB to the image). I think tar might do it, but I haven't come up with the magic steps to get it back onto the SD.
Any help would be appreciated. Thanks.