For (1) in many case there is a Management Engine or PSP that can access the RAM, and in some cases the RAM content might never be wiped, so using wipe is still a good idea here. An alternative would be to power off the computer, remove all power sources and wait a bit.
Re: "Delete this backup"
For (1) in many case there is a Management Engine or PSP that can access the RAM, and in some cases the RAM content might never be wiped, so using wipe is still a good idea here. An alternative would be to power off the computer, remove all power sources and wait a bit.