Error message: "Backup could not be created." – GMG Support

If you get this error message when trying to backup, there is an error in the path structure of your database. Use the integrated scan option to detect and repair the corrupt files:

From the program menu, choose System > Check Database....
The Database Consistency Check dialog opens.
On the tab Check, click Start.
In the lower half of the window, all existing conflicts are listed then.
Under Auto Repair, you can see the conflicts that GMG ColorProof can automatically resolve for you. For this purpose, confirm by clicking Repair.
Under Manual Repair, you can see the conflicts requiring your manual action. For this purpose, click Repair next to the conflict.
A new dialog opens.
In the dialog, you see a detailed error description that specifies what action is required.
Repair the conflict accordingly.
Repeat steps 5 - 8 for each displayed conflict.