Nero's backup is broken. Plain and simple. The App Compat Toolkit won't
change that. All it does is make it easier to set an application to not ask
for elevation. To perform a backup only of your data requires no
administrative privileges and does not need to be elevated. At best, the App
Compat Toolkit can help you create one of those.
To perform a backup of data that is not yours requires the Backup Files
privilege, which is one of the privileges removed under UAC. The fix is for
Nero to rewrite their backup so that it works with UAC. This, in fact, is
*exactly* the purpose of UAC, to force vendors to write applications that you
can use safely, without having to be an administrator. Nero, instead of
allowing you to use your computer safely, simply tells you to turn off
security by being an administrator, putting you and your data at risk. You
should think at least twice before you use software from a company that so
blatantly disregards your safety and the privacy of your data.
Until such time as Nero fixes their software try using the Windows Backup to
do backups for you. Click the Window button and type "Backup" in the search
box. Then click on "Backup and Restore Center." Now click the "Back up files"
button and accept the elevation. At this point you can create a backup task
that is schedule to run any time you decide. Since the task is executed using
a system service no elevation is needed at the time the task runs.
The drawback of the Windows backup is that you have next to no control over
what actually gets backed up. If you use the normal backup it will back up
your files only. If you use the Complete PC Backup it will back up
everything, including the system files. It is a neat option, but you have to
have equivalent or better hardware to restore it. For example, if you back up
a system with a 320GB drive and then try to restore onto a system with a
250GB drive the restore will fail. If you restore onto a drive with 500GB it
will work.