Correct you need 50 different jobs.
This is not a bad thing. In fact, I prefer this method for backups. You should try to think about it, and understand that it's actually EASIER to manage. It's makes it easier to put servers under maintenance and pause jobs, if one server were to fail, only one job fails, it's easier to restart one simple server backup and not a large job with multiple servers...
That said, I find it easier to manage multiple jobs, and of course if you have a good naming convention to go with the job names