Move your program files from an SSD drive to an HDD drive without reinstalling the programs on the target drive using Robocopy or Easus.

If you buy a Samsung SSD, then you can use their Data Migration software to transfer files and applications from one Windows 10 PC to another PC.

How to Transfer Files From C: Drive to the F: Drive. Applications that enable you to back up critical business data are readily available, including the backup utility in Windows.

After the SSD has been initialized, plug it into the Steam Deck. This is the time to delete any games you have on the Deck for the sake of taking less time to transfer files.