It is possible to move the Roon database between Mac/Linux. Have you made sure to follow our Migration Knowledge Base Article? How are you transferring the backup over, are you using Dropbox / USB / Network Share?
yes i tried to follow exactly the procedure on basic knowledge.
i used 3 different usb hardrive.
wd,toshiba,and a seagate.
the toshiba is for pc ,is it the problem? please help
What is the email address associated with your Roon account? Can you let me know via private message? I will start a message thread with you so you can let me know there.
On the old Core (the Macbook), can you try to create a new backup, set the old database aside, and try restoring the backup (on the same Macbook) and see if that works?
Restart/Reinstall the Roon App to generate a new Roon folder
Try restoring the backup you created in step #1 on the same PC
Note, this test does not involve the Euphony or anything else, I just want to make sure backups restore on a fresh database on the same Macbook as a starting point.