You can share a mount path with multiple Media Agents for Air Gap Protect.
Procedure
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From the CommCell Browser, expand to Storage Resources | Libraries | <Library>. 
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Right-click the mount path that you want to share with another MediaAgent, and click Share Mount Path. 
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Select the mount path and click Share. 
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From the Share Mount Path dialog box, perform the following: - 
Select the MediaAgents that you want to share the mount path. 
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Click OK. 
 
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Click Ok to confirm your selection. 
Result
The mount path will be shared and the selected MediaAgents will have read-write access to the mount path.