User Case: Synology Cloud sync with Box doesn't sync properly

Synology Box Sync
Synology Box Sync

I have two Synology NAS devices set up with the Cloud Sync BOX service. Both NAS units show successful synchronization with the BOX cloud. However, I'm experiencing issues with properly syncing new or changed files/folders. Here's what I've tested and the results:

  1. Changes or additions made directly on BOX do not sync to the local Synology NAS.
  2. Changes or additions made on one of the Synology NAS units sync to the BOX cloud but not to the second NAS.

I've already updated the latest pending DSM update and the latest Cloud Sync version, but it hasn't resolved the issue.

Why Make Synology Box Sync?

Syncing Box to a Synology NAS (Network Attached Storage) can offer several advantages, especially if you use both platforms in your workflow. Here are some reasons why you might want to sync Box to a Synology NAS:

  • Data Backup: Syncing Box to a Synology NAS provides an additional layer of data backup. Your files in Box are stored in the cloud, but having a local backup of your Box files on your NAS ensures data redundancy and minimizes the risk of data loss due to cloud service outages or accidental deletions.
  • Data Privacy and Control: Some users prefer to have more control over their data. By making Synology Box sync, you keep a local copy of your files, which can be especially important if you have sensitive or confidential data that you want to keep on-premises.
  • Faster Access: Accessing files from a local NAS can be faster than downloading them from the cloud, especially for large files or when you have limited internet bandwidth. It can also be useful in situations where you need to access your files offline.
  • Automated Backup and Sync: Synology NAS devices often come with built-in tools for automated backup and synchronization. You can schedule regular syncs or backups to ensure that your Box data is always up to date on the NAS.

How to Make Synology Box Sync via MultCloud

As you can see in the “User Case” part, you may encounter the same issues when you use Synology Cloud Sync to sync Box to Synology NAS. Due to this reason, you may use MultCloud as an alternative. MultCloud also has a function called “Cloud Sync” which specializes in syncing files between cloud drives.

So, why MultCloud is recommended as the best alternative:

  • MultCloud also supports to connect various clouds with Synology NAS. Actually, you can manage more than 30+ cloud drives on MultCloud, such as Google Drive, iCloud Drive, OneDrive, Dropbox, Box, and NAS.
  • MultCloud also allows you to manage different accounts in one cloud. So, you can also make Synology Box sync with different accounts.
  • Except for the Schedule feature to set a sync frequency, MultCloud additionally offers the “Filter” feature to help you select your desired files to sync. Also, there are 7 sync modes that you can apply to your task.
  • MultCloud used bandwidth to transfer files. The transfer process will be more stable and the speed will be faster than relying on the network connection. Another advantage of using bandwidth is that you don’t need to open the task window until it is completed. But shut down the task window or your computer, and the sync will still go on.

See the steps for using MultCloud Cloud Sync to make Synology Box sync below.

Step 1: Open MultCloud and sign up for a new account.

Step 2: Add Box and Synology NAS to MultCloud. First, click “Add Cloud” in the left bar and choose the cloud icon. Then log in to the cloud account in the pop-up window.

Add Box and NAS
Add Box and NAS

Step 3: Open “Cloud Sync” and click the 2 boxes to choose Box and NAS as the source and target clouds. Finally, tap on “Sync Now” to let Box sync to Synology NAS.

Synology Box Sync
Synology Box Sync


  • Before starting the task, you can open “Options” and “Schedule” to add a sync mode, batch-select the desired files, and set a preferred sync frequency.
  • Also, you may want the sync task can go between 2 clouds. So, you can switch the One-way sync to Two-way sync. Then the files will update from Box to Synology NAS and from Synology NAS to Box.
  • You can also use Real Time Sync to make the sync task run constantly. In this regard, you can purchase more traffic than the 5GB to support this sync mode.
Synology Box Sync
Synology Box Sync

How to Make Synology Box Sync via Synology Cloud Sync

Synology Cloud Sync is a data synchronization and backup service provided by Synology. Cloud Sync is designed to facilitate the seamless transfer of data between your Synology NAS and various cloud storage providers, such as Dropbox, Google Drive, and Microsoft OneDrive.

Since Synology Cloud Sync supports Box, you can also sync Box with Synology NAS with it. But you may encounter the Synology Cloud Sync suspend issue.

Step 1: Download Synology Cloud Sync to your computer.

Step 2: Click on the plus icon in the upper-left corner and choose Box in the Cloud Providers menu. Then go through the identity authentication and click “Next”.

Choose Box
Choose Box

Step 3: Fill in the “Task setting” blanks according to your needs and click “Next”.

Adjust Settings
Adjust Settings

Step 4: Check the settings on the “Confirm settings” page. If everything is ready, click “Apply” to run the Synology Cloud Sync Box task.

Click Apply
Click Apply


When it comes to making Synology Box sync, both MultCloud and Synology Cloud Sync solutions offer valuable options. Whether you opt for the versatility of MultCloud or the seamless integration of Synology Cloud Sync, you'll find powerful tools to streamline your cloud data management needs.

How do I sync my Synology NAS data?
If you want to sync Synology NAS data to Google Drive, SharePoint, OneDrive, or another cloud drive, MultCloud will be a good choice. To use MultCloud, you can refer to the steps for Synology Box sync in the former part: Create an account > Add NAS and a cloud > Create a Cloud Sync task > Click “Sync Now”.
How do I sync local files to my NAS?
To sync local files to your NAS (Network Attached Storage), use file synchronization software like rsync (Linux/Unix), Robocopy (Windows), or a NAS-specific tool. Connect to your NAS via its IP address, specify the source and destination folders, and initiate the sync. Ensure proper permissions and network connectivity for a successful sync.
What is the difference between Synology Sync and backup?
Synology Sync typically refers to file synchronization, where data is mirrored between devices or folders in real-time, ensuring both have the latest versions. Backup, on the other hand, involves periodic data copies to a separate location, allowing you to restore previous versions if needed. Sync maintains current data, while backup preserves historical data.

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