If the jobs are targated to a Tape, they will be executed 1 after the other.
If targeted to a B2D then you can set on the B2D properties as to how many jobs can run simultaneously.
I do not see where I could "Displays the number of concurrent write" in the properties of my storage?
I am using a Synology NAS unit. Should it be on the storage properties of this?
Sorry. I see it now. It is set defaulted to 1. To be correct if I choose 5 systems to backup as one job, it would only write the information to the storage one system at a time?
Correct, the settings for concurrent writes have to do with INDEPENDENT JOBS - essentially How Many Simultaneous Jobs can be writing to the storage device.
When you are able to choose multiple systems in a Single Job, they will only run sequentially no matter what value your storage device setting for concurrent writes may be.