Ive just upgraded from 5.6u? (3 or 4, cant remenber) til 6.0.1 - But at the same time upgraded ALL hardware..
Tried to "Backup to Desktop", then fresh install of 6.0.1 on the new machine, and then a restore...
Worked perfectly

EVERYTHING got restored, even my portforwarding - which wasnt a part of a standard 5.6 install... The only thing i had to reinstall was Sysmon..
T