src/vs/platform/userDataSync/common/userDataSyncBackupStoreService.ts/UserDataSyncBackupStoreService/getAllRefs
class UserDataSyncBackupStoreService:	async getAllRefs(resource: SyncResource): Promise<IResourceRefHandle[]> {
		const folder = joinPath(this.environmentService.userDataSyncHome, resource);
		const stat = await this.fileService.resolve(folder);
		if (stat.children) {
			const all = stat.children.filter(stat => stat.isFile && /^\d{8}T\d{6}(\.json)?$/.test(stat.name)).sort().reverse();
			return all.map(stat => ({
				ref: stat.name,
				created: this.getCreationTime(stat)
			}));
		}
		return [];
	}