Application Snapshots
Pressing the iPhone home button shrinks the iOS application and moves it to the background.

Application Snapshots

Pressing the iPhone home button shrinks the iOS application and moves it to the background.
The shrinking effect requires taking a screenshot of the application and storing it in the /private/var/mobile/Library/Caches/ Snapshots folder in the application home directory.
This might result in storing sensitive information on the device. Snapshots stored on the iPhone will automatically clear after the device is rebooted.
SANS Institute | What's in Your iOS Image Cache? | SANS Institute
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