I started running a sudo DD on the console to clone my drive into a new 1tb but the console turned off 20 gigs in and it looks like it cancelled the copy. I restarted the command but I got thinking about the data it already copied. Is this duplicate data going to be overwritten? Am I going to have problems launching the drive due to the incomplete transfer? Should I format and restart? If so how do I do so? Thanks
Generally if you doing a copy/clone or whatever it will replace whatever was there before.
I used CloneZilla for when I did backups and restores. It runs off a USB thumb drive. Takes pretty long; longer than it seems copying that amount of data should take, but it works and has worked well for me.
Done it a couple times now. Once I get my Steam Deck setup well initially, I make a snapshot of it with CloneZilla I can restore to.