Backup Cancel 150 Error

Hi Experts,

I was stuck in a situation when i had to make way for one urgent backup as drives were not free. So what i did i cancelled the backups and these got failed with 150 error. Backups were flat files and VM...

Problem was when i cancelled these backup these manulaly failed backup got initiated automatically and occupied the drives again.

So pls tell me where is the setting in flat files and Vmware where we could configure the settings for these servers.

We dont want if we cancel these backups manually these would get re-run again automatically.

Pls help.

Thanks,