Click the settings icon at top right -> integrations, and get connected.
Google Sheets: The sheet will be updated each time the report runs at the scheduled time (the existing data will be replaced with the updated data).
The reports will be placed in the root folder of your Google Sheets/Drive. You can move the file to another location, and it will continue to update.
Dropbox/Google Drive: Each time the report runs at the scheduled time, a new file will be created (older files/reports will be kept).
Reports will be placed/saved:
Dropbox: Dropbox/Apps/ProRankTracker/%report Name%/%your given report name%
Drive: Drive/ProRankTracker/%report Name%/%your given report name%