By Ivy / Last update December 13, 2021

The Issue

“I had Cloud Sync running fine several months, to sync one of my folders on Synology NAS to My Dropbox. A couple of days ago, Synology Cloud Sync stopped syncing, and showing ‘Connecting’, so i restart the task, still the same problem, I can’t find a solution to fix it, what should i do to sync data? Please help, Thanks.”

Synology Cloud Sync Connecting

Besides, you may meet other situations that Synology Cloud Sync not working problem while Cloud Sync states up to date (actually it’s not) and did not sync anything.

Synology Cloud Sync Up To Date

About Synology Cloud Sync

Cloud Sync is a feature of Synology NAS, which allows you to sync data between local Synology NAS and cloud drives, these clouds include Google Drive, Dropbox, OneDrive, Amazon Drive, etc. It is capable of doing the one way sync and two way sync (bidirectional sync), schedule sync.

Quick Fixes to Synology Cloud Sync Not Working

What should you do to fix Cloud Sync not working problem? There are some proven solutions you could try (not 100% guarantee):

Way 1: Delete the sync task and create the task again.

Way 2: Restart Synology NAS to resume sync files.

Way 3: Get cloud authority again

Sometimes, the Synology Cloud Sync not working due to the expired authorization of the cloud API. Because Synology Cloud Sync does not prompt you about this problem just failing silently. 

However, you might get the “Unknown error occurs. Please try again later.” message after reconnecting your Clouds.

Synology Cloud Sync Unknown Error Occurs

Besides, Cloud Sync does not allow you to sync incremental parts, even only a few changes on your file, you have to download or upload the file.

If you still cannot fix Synology Cloud Sync to Dropbox not working problem, It’s time to turn another reliable file synchronization software for help.

Reliable Way to Sync Synology NAS to Dropbox

As the best file sync software - AOMEI Backupper Professional allows you to sync Synology NAS to clouds easily in Windows XP, Vista, 7, 8, 8.1, 10. It’s highly recommended by millions of users due to its reliable performance, comprehensive features and intuitive interface.

There are multiple sync features provided in this file sync software:
Basic Sync: Sync files and folders to local disk, external hard disk, USB flash drive, CD/DVD, network share or NAS, cloud drives, schedule sync, etc.
Mirror Sync: always keep the files in the destination exactly the same as the source.
Real Time Sync: once the changes made on the source, it will automatically sync changed or newly added files and folders to the destination
Two Way Sync: Sync files and folders from each other. Any changes in the source or destination directory will be synced to the other side.

Download Free Trial

Win 10/8.1/8/7/XP

Secure Download

Let’s see how it works to sync Synology NAS to Dropbox easily in Windows 10 computer to avoid Synoloy Cloud Sync not working problem:

Step 1. Perform AOMEI Backupper Professional, and choose Real-Time Sync at the Sync tab.

Real Time Sync

Step 2. Click + Add Folder button > Share/NAS > Add Network Location > input the Network Path (IP address of Synology NAS), user name and password, and click OK to add Synology NAS, and choose the folders you prefer to sync.

Add Folder

Add Network Path

★Tip: Rename Task Name for the real time sync task if you want to differ from other sync tasks.

Step 3. Tap the inverted triangle icon > Select a cloud drive > choose Dropbox as the destination.

Select a Cloud Drive

Select Dropbox

★Tip: Ensure you have installed Dropbox desktop app first.

Step 4. Click Start Sync >> to sync Synology NAS to Dropbox automatically in Windows 10.

Start Sync Synology NAS To Dropbox

★Tip: The Options could allow you to comment on the sync task, check the integrity of files in the destination during synchronization, etc.

After the first full file sync finished, any changes on the source directory will be immediately synced to the destination since the last file sync (sync in real time) to save your Dropbox cloud storage space.

Write in the End

Find the solutions to fix Cloud Sync in Synology NAS not working, If you can’t solve it, please try another reliable file sync software - AOMEI Backupper Professional to sync Synology NAS to Dropbox in real time with only four steps.

If you would like to sync Synology NAS to Clouds on Windows Server systems, please install AOMEI Backupper Server to enjoy more features, like sync files between Windows Servers, sync two NAS servers, etc.