src/vs/platform/backup/electron-main/backupMainService.ts/BackupMainService/serializeBackups
class BackupMainService:	private serializeBackups(): IBackupWorkspacesFormat {
		return {
			rootURIWorkspaces: this.workspaces.map(workspace => ({ id: workspace.workspace.id, configURIPath: workspace.workspace.configPath.toString(), remoteAuthority: workspace.remoteAuthority })),
			folderURIWorkspaces: this.folders.map(folder => folder.toString()),
			emptyWorkspaceInfos: this.emptyWindows
		};
	}