HBS causing machine reset when doing a Full backup

[Mike]

I have been suffering from a persistent issue with HBS.
Last full backup was successfully completed about 3 months ago

I have set an incremental backup schedule :-

• medium compression
  

• the 1st of each month
  
• start if missed
  
• after 3 incremental do a full
  

Since the last scheduled full backup I have been plagued with my machine crashing during a backup at between 60% to 75%

I have tried to find logs for HBS, but I can' find anything of any use to track down what is crashing my machine.

Any hints gratefully appreciated.