Whenever a report is exported to Excel, PDF, or other formats using the built-in tools, Snapforce will automatically log a record of that export in the global Audit Trail.
To view these events, click your Username -> Settings.
Under Data Administration, click Audit Trail.
Any exports that were completed will show up in the Audit Trail.
(Note: Each page exported will display one instance in the audit trail. For example, if you see the same export listed three times, this means that three pages of this report were exported. This does not mean that the export was completed three times.)
Clicking the link within the record will bring you to the specific report or list that was exported so that you will have an idea of what information might have been exported.