How to create new USB disk from Spare Pro key.backup?

[montery]

I have been using Unraid for 10+ years now, and I have a spare pro key.backup file on my currently installed flash drive.  I've been upgrading drives, ram, CPUs, and versions of Unraid since.  But I've never actually upgraded the motherboard.  This means that my trusty Supermicro X8DT3 motherboard, while still capable for the limited NAS functions I run on it, is time to retire it to "backup server" status, and to embark on a new server (I'm probably going to pull the trigger on a H12SSL-i motherboard + EPYC 7313P CPU which will serve me well for another 10+ years, hopefully!).  

 

Over these 10 years, a certain amount of "cruft" has built up, and I'd like to do a fresh "all-new" install of the Unraid OS, but still keep my drives and (most importantly) the plugin + docker settings.

 

I regularly run appdata backup.

 

So, my two question are:

1) What are the steps I should follow to use my 10 yr old spare pro key on a new thumbdrive?  Just rename it Pro.key?  

2) Assuming I want to keep my existing disk assignments and plugin/docker settings, what to do?  Just copy the plugins directory and docker.cfg from the current USB?

Edited August 16 by montery