By Ailsa twitter/ Last Updated March 26, 2022

Why Do You Need Cloud Backup?

  • Are you afraid of accidentally losing the data stored on your hard drive?
  • Are you anxious that there is not enough space locally for backup?
  • Are you panicked that you have lost all local backups due to local accidents?
  • Backup all your data to the cloud offsite, never lose data and recover them from any PC.

Eliminate all your concerns with the Best Cloud Backup service - CBackup

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Synology Cloud Sync Dropbox Not Working?

"For some reason Synology Cloud Sync stopped syncing and THINKS it is up to date.
Here below you can see what I mean - It knows my Dropbox account has 280GB of data .. but it stopped syncing at about half that. Please help me, Thanks a lot."

--Question from

What should you do If your Synology Cloud Sync to Dropbox not working? Here comes the 8 solutions and 2 tips for you.

Way 1. Update Synology Cloud Sync and Dropbox

Did you run the latest Synology Cloud Sync software and Dropbox, please install the latest versions for the two software, and try again to see if the Synology Cloud Sync Dropbox not working problem solved.

Way 2. Stop and Restart Synology Cloud Sync

If you running the latest version of Synology Cloud Sync and Dropbox, and still cannot fix the problem, please restart the Synology Cloud Sync software. And then try to create a new task to sync Synology NAS to Dropbox to check if solved.

Way 3. Pause Syncing and Resume Syncing

Still stuck in Synology Cloud Sync Dropbox not working problem, even it shows up to date? Please click Manage button, and choose Pause Syncing.

Synology Cloud Sync Pause Syncing

After a few minutes, please choose Resume Syncing.

Synology Cloud Sync Resume Syncing

Then check whether the problem fixed or not.


Way 4. Unlink and Relink Dropbox Account

1. Click Manage > Unlink to remove Synology Cloud Sync access to Dropbox.

Unlink Dropbox Account

2. Then choose Dropbox again and press Next. Click Allow > Agree to grant Synology Cloud Sync authority to access your Dropbox account.

Relink Dropbox

3. Specify the source folder in Synology NAS and destination folder in Dropbox, and the sync direction, press Next.

4. Press Apply if you confirm the sync settings of Synology Cloud Sync to Dropbox.

Relink Successfully

Way 5. Increase the Number of Concurrent Uploads or Downloads

Synology Cloud Sync allows you to increase the number of concurrent uploads or downloads to improve the overall synchronization performance.

1. Please click the gear icon at the bottom left, and then specify the number of Concurrent uploads/downloads to get better sync performance.

Specify Concurrent Uploads Downloads

Way 6. Check Your Internet Connection

If you have a poor internet connection, the Synology Cloud Sync to Dropbox will not work or you can sync a part of the data and then just stopped working.

Ensure you have a good Internet connection while syncing Synology NAS to Dropbox with Synology Cloud Sync.

Way 7. Change Dropbox Bandwidth

Sometimes, Synology Cloud Sync Dropbox not working if you set up the upload limit for Dropbox. Typically, Dropbox limit automatically for Upload rate. You could go to Dropbox desktop app Preferences, tap the Bandwidth tab and tick the option Don’t limit

Change Dropbox Bandwidth

Then Synology Cloud Sync Dropbox not working should be solved. 

Way 8. Upgrade Dropbox to Get More Cloud Storage

If you stuck in Synology Cloud Sync not working problem or stopped working, you may need to check your Dropbox cloud storage. If your Dropbox is full, and Synology Cloud Sync to Dropbox will stop and cannot sync data anymore.

You could do the following things to get more Dropbox cloud storage:

  • Complete the getting started checklist

  • Invite your friends - up to 16 GB

  • Submit feedback to Dropbox

  • Try Dropbox Business free for 30 days

  • Upgrade Dropbox to get more cloud storage.

Better Way to Sync Synology NAS to Dropbox

If the Synology Cloud Sync Dropbox not working still cannot be fixed, there is another way to sync Synology NAS to Dropbox easier. The free Windows backup software AOMEI Backupper Standard will do you a big favor. Ensure you have installed the Dropbox desktop app.

1. Please perform AOMEI Backupper Standard after downloading and installing, then select Sync > Basic Sync subsequently.

Basic Sync

2. Press + Add Folder > Share/NAS > Add Network or NAS Devices > input the IP address of Synology NAS as Network Path, then input your credentials and click OK. Then choose folders in Synology NAS.

Basic Sync Add Folder

3. Tap the inverted triangle icon and Select a cloud drive, choose Dropbox and click OK.

Select A Cloud Drive

Select Dropbox

4. (Optional) Click the Schedule option at the bottom left, choose daily, weekly, or monthly to sync Synology NAS to Dropbox regularly.


5. Hit Start Sync >> button to avoid Synology Cloud Sync Dropbox not working problem. 

Best Free Way to Increase Dropbox Cloud Storage Space

If you want to get more Dropbox free cloud storage without buying extra storage, it’s highly recommended to increase Dropbox cloud storage for free with the cloud backup service CBackup. CBackup allows you to merge multiple Dropbox accounts into one big backup space, and backup files to Dropbox.

Download CBackup Win 11/10/8.1/8/7/XP
Secure Download

Step 1. Please create a new CBackup account and sign in to your CBackup account.

Sign In

Step 2. Click the My Storage tab on the left, then press + Add Cloud button, then choose Dropbox and click Add. Then follow the on-screen guide to allow CBackup to access your Dropbox files.

Add Cloud

Step 3. Modify the Display Name, and Storage Path, then tick the option “Note: Please do not change the path directly in the third-party cloud, nor modify or delete the backup file.” and click OK. Then your Dropbox account has been added to CBackup.

Complete Dropbox Info

Step 4. Repeat the process of Step 2 and Step 3 to add more Dropbox accounts, even different clouds, like Google Drive, OneDrive, etc. And go to My Storage > + > New Combined Cloud to tick all cloud drives.

Add Combined Cloud2

And now, your Dropbox cloud storage has been increased for free.



Try the above 8 solutions if you stuck in Synology Cloud Sync Dropbox not working problem, there is a better way to sync Synology NAS to Dropbox if you still cannot fix Synology Cloud Sync not working. Try the free cloud backup service CBackup to increase Dropbox cloud storage space for free.

Besides, CBackup could also help you to transfer files from cloud to cloud directly, which is convenience for you to perform cloud to cloud backup. PC cloud backup is another powerful feature CBackup provides.

Get Unlimited Cloud Storage for Free to Protect Files with CBackup

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