Snapshot error brings down site

My server was brought to a standstill today b/c of the snapshot plugin. I was able to see that there was an error that the plugin couldn't write to the proper directories, which I have fixed. I'm afraid to reactivate this plugin in case it happens again. Can you tell me what the backend processes are so that I can monitor them to make sure this doesn't happen again? I'd like it if this plugin would simply stop running/end its process if it can't write to the directories, and write to the log file, so I can track it.