src/vs/platform/backup/electron-main/backupMainService.ts/BackupMainService/convertToEmptyWindowBackup
class BackupMainService:	private async convertToEmptyWindowBackup(backupPath: string): Promise<boolean> {
		const newEmptyWindowBackupInfo = this.prepareNewEmptyWindowBackup();

		// Rename backupPath to new empty window backup path
		const newEmptyWindowBackupPath = join(this.backupHome, newEmptyWindowBackupInfo.backupFolder);
		try {
			await Promises.rename(backupPath, newEmptyWindowBackupPath);
		} catch (error) {
			this.logService.error(`Backup: Could not rename backup folder: ${error.toString()}`);
			return false;
		}
		this.emptyWindows.push(newEmptyWindowBackupInfo);

		return true;
	}