SQL Backups Server components need to be installed on any server you want to run backups on (so in your case, all 3, meaning you'd also need 3 licenses)
The GUI (the front end you interact with) can be installed anywhere you want (be it on each server, on your own PC, or somewhere else) and doesn't need to be licensed, so if you have, say, 10 DBA's they can all run the GUI on their own PC.
Hi, at the time of Installation be carefully check all SQL Backups Server components are successfully installed are not,if not then this backup software will not work properly so install SQL Backups Server very carefully.
Comments
The GUI (the front end you interact with) can be installed anywhere you want (be it on each server, on your own PC, or somewhere else) and doesn't need to be licensed, so if you have, say, 10 DBA's they can all run the GUI on their own PC.
Redgate Software
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Redgate Software