private async Task WriteStorage(
Dictionary <Guid, Point> points,
Dictionary <string, Tag> tags)
{
if (await _storageClient.ExistsAsync(_storageBackupPath))
{
await _storageClient.DeleteAsync(_storageBackupPath);
}
if (await _storageClient.ExistsAsync(_storagePath))
{
await _storageClient.CopyAsync(_storagePath, _storageBackupPath);
}
var pointsJson = JsonConvert.SerializeObject(
points.Values.Select(p => p.ToDataContract(tags)).ToList(),
Formatting.Indented);
await _storageClient.WriteAllAsync(_storagePath, pointsJson);
}