Norton do not appear to have a backup product designed for SBS.
Symantec's product for that environment is Backup Exec.
As far as SBS is concerned, it does not think you have a backup (and
it is probably right), so it will complain. I have not dug into SBS 2011
enough yet to know if it is possible to disable the backup check. You
could always schedule an SBS backup to somewhere convenient (that is
then picked up by your Norton product), which would make SBS happier.
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