What Does System Checkpoint Mean?
A system checkpoint is a bootable instance of an operating system (OS). A checkpoint is a snapshot of a computer at a specific point in time.
Techopedia Explains System Checkpoint
Windows operating systems use the term system checkpoint to represent a restore point of the system. Restore poitns are set prior to Windows Update running, when certain new software is installed, etc. The system checkpoint a configurable setting to set restore points on an ongoing basis (generally every 24 hours).