Error code

macOS -69716

MACOS-69716
System Error Code· A POSIX/system errno returned when a system call fails.

What it means

APFS snapshot error — an APFS snapshot could not be created or rolled back..

How to fix it

  1. Run Disk Utility First Aid on the APFS container in Recovery mode.
  2. delete stale snapshots with `tmutil listlocalsnapshots /` then `tmutil deletelocalsnapshots <date>`.
  3. ensure sufficient free space on the volume.

Not affiliated with macOS. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.