Well an interesting thing last night.
I have now moved, from what I can tell all the backup jobs on the NAS from One directory/folder, each to their own directory off of one folder. eg.
\Varitas Backup\Exchange
\Varitas Backup\Accpac
\Varitas Backup\etc
These backups run
2x Run Mon-Thurs
2xRun Daily
1xMonthly
2x (duplicates runs Mon-Thurs)
1x (duplicate runs only friday
Last night only one went off line. "The Exchange Backup Daily - Diff.". This runs daily. (of course the monthly and friday did not run ) Strangely yesterday night they all failed but one.
Anyway I will keep track of this and see if a pattern continues.
Regards