Hi,
Have a look at a part of our Best Practise Guide:page 29.
Generally, SMSP Manager can use a range of the port numbers 12000-12012, but if there is a conflict with any other application, then you can use a port number beyond this range as well.
Note: Customer with Co-existence of SnapManager for SharePoint with Avepoint DocAve, note that the ports will need to be changed if DocAve is used along with SnapManager for SharePoint in the SharePoint Farm.
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