Nero backit up problems

Nero backit up is schedule to do daily backups on a winnt
machine; Backups start every night at 10. However, on 2 days of the week, specifically on Sunday and Monday,
Nero backip up doesn’t start at all;I figure the program is not supposed to do backups on weekends, and somehow one day of
the week is shifted forward (Saturday becomes Sunday and Sunday becomes Monday). Is there any way to correct this?
I wouldn’t mind if the program starts on all the seven days of the week including weekends.

P2 system
Winnt o/s
256mb ram
10gb hdd