src/vs/workbench/services/workingCopy/common/workingCopyBackupTracker.ts/WorkingCopyBackupTracker/onDidRegister
class WorkingCopyBackupTracker:	private onDidRegister(workingCopy: IWorkingCopy): void {
		if (this.suspended) {
			this.logService.warn(`[backup tracker] suspended, ignoring register event`, workingCopy.resource.toString(), workingCopy.typeId);
			return;
		}

		if (workingCopy.isDirty()) {
			this.scheduleBackup(workingCopy);
		}
	}