Microstudio will back up any cdg disk it's just that with multisession you will need to import in the HD and press eject once it stops reading on the last track than just burn the disk using Custom Assembly. It's a little longer but it works.
So far, I was able to burn any new Top Tunes or SC that has multisession
Have Fun!
PS-So far, Microstudio is the only software capable of handling Multisession's using that little trick
