Some information displayed in the right places, and based on the user rights, could be helpful to have a better idea of what's happening in the synchronization.
When Backbone synchronizes big loads of issues, it is unclear to the user if Backbone actually does something right now or not. The only indication is to see if issues get created or updated.
Scenarios where this might be helpful:
Backbone is setup in a project which already has a lot of issues, so the initial sync takes a significant amount of time.
A resync in a project with many issue.
New functionality for Scenario
Backbone should visualize its activities, e.g. show how many issues currently are getting exported or imported, show a percentage of the initial issue scan after starting a sync