The CK has the option in it's preferences. It's disabled by default.
Go to File > Preferences and switch to the Misc tab. 4th option down - Auto Save every xx minutes. Fill in your numbers and Apply.
Backups will be saved in Skyrim\Backup\ and will have the naming convention -
YourMod.esp.0.bak
YourMod.esp.1.bak
YourMod.esp.2.bak ...etc
Make sure you sort this folder by Date modified. The highest number will not always be the latest save.