src/vs/workbench/services/workingCopy/common/workingCopyBackupTracker.ts/WorkingCopyBackupTracker/onWillShutdown
class WorkingCopyBackupTracker:	private onWillShutdown(): void {

		// Here we know that we will shutdown. Any backup operation that is
		// already scheduled or being scheduled from this moment on runs
		// at the risk of corrupting a backup because the backup operation
		// might terminate at any given time now. As such, we need to disable
		// this tracker from performing more backups by cancelling pending
		// operations and suspending the tracker without resuming.

		this.cancelBackupOperations();
		this.suspendBackupOperations();
	}