Mac computers, running MacOS, offer a feature which Apple calls "safe sleep":

"Every time the Mac goes to sleep, the current state of the computer is saved to the drive, including all open applications and documents. ... If the battery is depleted or replaced while the computer is in 'safe sleep', the next time it is turned on, instead of re-booting, the previous state of the computer will be loaded from the sleepimage file." (Source.)

How can you enable "safe sleep" on a Windows PC?