You can put a MediaAgent into maintenance mode so that it does not run backup, restore, or auxiliary copy operations.
When you put a MediaAgent into maintenance mode, if a job is running on the MediaAgent, the job goes into a waiting state until another MediaAgent runs it.
Even in maintenance mode, MediaAgents can perform administrative tasks, such as drive cleaning, on attached devices.
Procedure
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From the navigation pane, go to Manage > Infrastructure. The Infrastructure page appears. 
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Click the MediaAgent tile. The MediaAgents page appears. 
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Click the MediaAgent that you want to put into maintenance mode. 
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In the Activity Control section, move the Maintenance mode toggle key to the right.