Is the free version limited?

With BmuS (bmus.sh) you’ll get all core functions (backup & restore) without any limitation.

However, in the standard version, the report generator (bmus_dashboard.sh) only generates those statistics you would see if you set DASHBOARD_MODE to simple in bmus.conf. 

In other words: The standard version is limited to simple mode dashboard while you can switch from simple to pro dashboard and vice versa with the pro-version of the dashboard generator.