Thank you very much!
This all makes sense, although I don't know what caused the change. 
I will increase 
MaxBackups and MaxUserBackups from 2 to 6 
to see if it makes any difference.

I think the WakeupSchedule setting was changed to [23] 
a few years ago to prevent slowing the network down during production hours. 

If the number in MaxBackups is set correctly, does BackupPC need to wake 
multiple times?

Summary page:
I have noticed errors occur on Windows machines, 
assumed that was an attempt to backup open system files.
Last Backup: On servers that backup, status is DONE and this settings is less 
than one day. Usually .3...
On servers that do not backup, status is IDLE, the backup time is over 1 day. 
I'll investigate.

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