Backing-up and updating OpManager with the APM plugin

Backing-up and updating OpManager with the APM plugin

I have a question I can't seem to find the answer to.
I am using OpManager with the APM plugin. I would like to run my backup of OpManager so I can update it to the lateset build. How would I do this with the APM plugin running?

1. Do I have to stop the APM services before stopping the OpManager Services or will stopping the OpManager services force the APM plugin to stop as well?
2. When backing up the Database, how do I do so with the APM plugin's database since I assume they're different?
3. When backing up the Configuration of OpManager, does it backup the APM configuration as well or do I need to run that Backup separately?
4. With regards to Updating OpManager's Build, are there any issues with updating OpManager's build if no update is available for the APM plugin?