Hey there - having just tried this myself (from Nitrado > Windows AMP) here were a few of my gotchas:
Make sure your other server is powered down. If you look at logs, I believe you’ll see that it attempts to create a save when it receives the command to power down. Also, I experienced startup issues on the new server trying to copy the files while the old server was still online.
(hopefully you’re not experiencing the bug where the server fails to save and you lose two days worth of progress)
I had three files - copied all three and the save was perfect (serverfile, serverfile.backup, serverfile.journal)
Not sure if this one is applicable to you, using Docker, but I was having all sorts of problems with the files until I used winscp to ftp directly to the AMP instance.
YW! All three existed in the ‘savegame’ folder. Which, on Nitrado, was really the only folder I could access besides the Enshrouded folder that had the .json server config.
Found them! I did get the server to work once with the saves but now it just won’t reload them. Is there anything I might need turn on or off to force it to load the save?
)
I didn’t realize my other server was named the same thing. Oops! Everything is working perfectly now!