[itsme]

Don't worry, crop info, setlists, albums, collections and so on are song data that are stored in the MSP database. What Mike means with settings are program settings like language, tab settings and so on.
Regarding file paths: MSP stores "relative file paths" for files within the MSP folder, using subdirectories is fine. Only files from outside the MSP folder are copied to the root of the MSP folder during import. This is necessary to allow restoring a backup in a way that everything works as before. This is also the reason why backups contain all the song files.
This is why I recommended "store all your song files within the MSP folder"
Doing that allows copying just MSP databases between different devices, even between Android and Win10 devices. It will work if you take care of the same file and folder structure on every device. I do that all the time and I know of several users with a similar workflow.