I need to move off of the 512 GB NVMe I have dedicated to MSFS and onto a soon-to-be purchased 2 GB NVMe, however I have no free slots to copy content from NVMe to NVMe, so my plan at this point is to use the Steam “Move” option to move MSFS onto a SATA SSD I have in my system, swap the NVMe, and then “Move” again from the SATA SSD back to the NVMe.
Exciting!
I had a 500 GB Samsung 970 EVO Plus Gen 3 NVMe drive.
2 partitions on it.
C: \ → Windows 11 plus a few apps
D:\ → FS2020
I cloned this drive to a 1 TB Samsung 990 PRO Gen 4 NVMe drive.
Windows 11 & FS2020 works great.
No problems.
An USB to NVMe adapter is less than $20, and afterwards you can use to make use of your old, removed 500GB NVMe stick.
I’ve done that before with SATA-USB adapters. They tend to gather dust after a single use. My 500 GB drive is going to see a second life as a boot drive in my older system I’m planning to revive for someone who needs it. All of the HW upgrades spurred on by MSFS has left me with a nearly complete, highly capable 10th gen Intel system just sitting mothballed next to me 
Summarizing my final outcome.
I decided to do a complete uninstall of MSFS in the end … (I was trying desperately to avoid this - so thanks to everyone that offered support)
I moved my community folder to hopefully help prevent a complete re installation of all my add on liveries, sceneries and Payware aircraft.
What eventuated was - All day Friday the program re-installed (ignoring my attempts to shorten the process) My download speeds With Ultra Fibre averaged 45-55 Mbits/Sec.
All Day Saturday I installed the Marketplace purchases and updates …again 45-55 Mbits/sec.
Sunday (today) tidy up with 3rd party airports, pointing them to the directory. Moving folders and re-establishing links.
So - in essence approximately 2 and half days - (some I just left the computer downloads to do its thing).
Now, pretty much everything is back where it should be - except it is still on the original HDD. Why repair the HDD and not the SSD.? The truth is I felt I couldn’t trust the Clone data on the SSD
Not sure where to go from here as I still have a 790 Gb Steam folder (which includes MSFS) that I want to move to the SSD as well - so just moving the MSFS folder doesn’t really assist all that much. I want all of it over to the SSD - (This is why I choose to Clone in the first instance). I certainly don’t want to go through the rigmarole again of a clone corrupting the data). I have read the comments on Robocopy so I might just try that method…
Cheers to all
Congrats, and you have amazing patience.
It would appear that your Ultra Fibre is way way slower than advertised… ?
Anyway, you give me encouragement for by soon to be planned , SSD size update.
You are certainly wrong about a clone corrupting the data.
A clone is an exact copy.
Sure, the way to do it is by manually using the Robocopy command.
Sure, a person can do it manually better than those app programmers.
I think we discussed this earlier, but you should be able to move all of your Steam games using the Steam client.