Assume I have a WP application running, with lots of variables in SDRAM at that moment, and then I press the hardware button that puts the phone in standby (like the one next to the volume control buttons, in a Nokia Lumia 800), or just let the inactivity timeout expire. During that transition (from on to standby), and each time that it happens, does the OS save all the SDRAM contents to the flash of the phone?
With usual flash write endurances of about 100 kcycles, that would mean I can do that action about 55 times/day during 5 years (ignoring other wearing actions).