PrivacyGuard accesses your current location, the email addresses and phone numbers of your contacts, and various device identifiers (e.g., IMEI and advertising identifier).
PrivacyGuard looks for incidents where this information shows up in the outgoing network traffic of apps installed on your phone.
Nowhere.
PrivacyGuard remembers all leakage incidents (timestamp, type, and leakage content) in a database that is stored on your device. You can delete the records for an app in this database by long-clicking the name of the app in PrivacyGuard's main interface.