Mango Analytics does not modify or delete any data in your PBX.
Once configured, it will run on 2:00 AM every day to keep all cost data in sync with the latest call information.
The first import may take a lot of time, depending on the amount of calls placed and the physical resources of your PBX.
Mango Analytics will only analyse data from your currently active trunks and extensions. If you previously had other trunks or extensions configured, their data will not be available.