Okay, another question, if the multicraft license had expired, would I still be able to connect via FTP and get the server files? (Taking in count the server is still on but multicraft doesn't work.)
If you had FTP set up on the server.
Actually tbh that will be unnecessary as you should be able to access the server itself. Unless you are using servers from hosting companies, it should be relatively easy to obtain the server files(remote access, or physical access, etc.)
If it is hosted by some company I would suggest you contact them for the server files.
Hope this helps!