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Dropbox is a popular cloud storage service that helps users store, organize, sync, and access their files across different devices. One of its most useful features is Dropbox Backup, which automatically backs up important folders on your computer to the cloud. However, there are times when Dropbox Backup does not work as expected. Files may fail to upload, the backup may get stuck, or you may see error messages about folders that cannot be backed up.
If Dropbox Backup is not working, the issue is often related to file conflicts, sync errors, external drive connections, or third-party tool configurations. This easy guidance explains the common causes of Dropbox Backup failure and walks you through practical solutions to get your backup working again.
What Is Dropbox Backup?
Dropbox Backup is a feature that automatically backs up folders on your computer to your Dropbox account. It creates a copy of your important files in the cloud, protecting them from hardware failure, accidental deletion, or theft. You can back up folders from your internal hard drive as well as external drives.
Dropbox Backup is available on Dropbox Plus, Professional, and Business plans. The free Basic plan does not include the Backup feature.
Why Dropbox Backup May Not Work
Dropbox Backup can fail for several reasons. Understanding the cause makes it easier to choose the right fix.
Some common reasons include:
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Files are locked or in use by other applications
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Conflicting cloud storage folders inside the backup
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External drive is disconnected or not recognized
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Special folder names that Dropbox cannot back up
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Dropbox account storage is full
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Outdated Dropbox application
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Sync errors in the backup queue
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Third-party backup tool authentication issues
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SSL certificate problems with third-party tools
For users who depend on Dropbox Backup to protect important files, resolving backup problems quickly is worthwhile.
Before You Begin Troubleshooting
Before starting any fixes, make sure your computer has a stable internet connection. A reliable connection helps Dropbox connect with your account and upload your files.
It is also useful to check that you have enough available storage in your Dropbox account. If your account is full or nearly full, backup will stop until you free up space or upgrade your plan.
If another version of Dropbox is already installed, you may need to update the application instead of performing a completely new setup.
Fix 1: Check the Sync Error Queue
The first step is to check the sync error queue in Dropbox. This is the most direct way to diagnose backup problems.
Click the Dropbox icon in your taskbar (Windows) or menu bar (Mac). Click your avatar in the bottom-left corner and select View sync issues. Files and folders that failed to back up will appear in the error queue. From here, you can see exactly which files are stuck and why.
If you see specific files listed, try to resolve the issues for those files first. Common issues include file locks, permission problems, or unsupported characters.
Fix 2: Close Applications That Lock Files
If the files or folders you are trying to back up are in use by other applications, Dropbox may not be able to complete the backup.
For example, if you have a document open in Microsoft Word or Excel, Dropbox cannot update that file until you close it. Database files that are actively being read or written can also block backup.
Close any applications that might have a lock on the files you are backing up, then try again.
Fix 3: Remove Other Cloud Storage Folders
If the folder you are backing up contains other cloud storage folders—such as iCloud, OneDrive, or Google Drive sync folders—Dropbox Backup may fail because of conflicts.
Dropbox cannot back up folders that belong to other cloud storage services. Move these folders out of your backup range, or restore the files to a local folder before backing up.
For example, if your Documents folder contains an iCloud Drive folder, move that iCloud folder to a different location that is not included in the backup.
Fix 4: Check External Drive Connection
If you are backing up an external drive, make sure the drive is properly connected and not unplugged.
If Dropbox displays a message asking you to "Connect your drive," reconnect the drive and click Done to resume the backup. If the drive is connected but not recognized, try a different USB port or cable.
External drives must remain connected for Dropbox Backup to work. If you unplug the drive, backup will pause until you reconnect it.
Fix 5: Rename Special Folders
Folders named ToolKit and FileHistory are not backed up by default because their names can cause technical issues.
If you need to back up these folders, rename them to something else before adding them to your backup. After renaming, you can add them to Dropbox Backup.
Fix 6: Check Your Dropbox Storage Space
If your Dropbox account is full or nearly full, backup will stop. Files will not upload until you free up space.
Log in to the Dropbox website and check your available storage. Delete unnecessary files or upgrade your plan if you need more space.
Remember that Dropbox Backup counts against your total storage quota. If you are backing up large folders, you may need a plan with more storage.
Fix 7: Update the Dropbox Application
If you are using an outdated version of the Dropbox desktop application, backup may not work properly. Outdated applications can have compatibility issues that prevent backup from completing.
Check for updates by clicking the Dropbox icon in your taskbar or menu bar, clicking your avatar, and selecting Check for updates. Install any available updates and restart the application.
Fix 8: Restart the Dropbox Application
Sometimes a simple restart can resolve backup problems. Completely quit Dropbox and then relaunch it.
On Windows, right-click the Dropbox icon in the taskbar and select Quit Dropbox. Then open Dropbox from the Start menu.
On Mac, click the Dropbox icon in the menu bar and select Quit Dropbox. Then open Dropbox from the Applications folder.
After restarting, check the sync error queue again to see if the backup resumes.
Fix 9: Sign Out and Sign Back In
If backup is still not working, try signing out of Dropbox and signing back in. This can reset the backup configuration and resolve connection issues.
Click the Dropbox icon in your taskbar or menu bar, click your avatar, and select Sign out. Then sign back in with your email address and password.
After signing in, check whether backup resumes.
Fix 10: Handle Third-Party Backup Tool Issues
If you are using a third-party tool to back up your website or data to Dropbox, the problem may be related to authentication or connection settings.
Refresh the Dropbox authentication token. This is the most common cause of third-party backup failures. Dropbox OAuth tokens are revoked after password changes or security reviews. In your third-party tool's settings, find the Dropbox connection option, disconnect it, and reconnect by completing the browser authorization flow.
Check the app folder. Tools like UpdraftPlus rely on a specific app folder in Dropbox to store and list backup files. If that folder is renamed, moved, or deleted, the tool cannot read or write backups. Check your Dropbox account for multiple app folders with the same name, or confirm the folder has not been altered.
Update the tool. Some third-party tools have outdated CA certificate bundles that cause Dropbox uploads to fail. The error message usually includes "SSL certificate problem: unable to get local issuer certificate." Updating the tool to the latest version often resolves this issue.
Local environment limitations. If you are running a website in a local development environment like MAMP and trying to back up to Dropbox, you may see an "Empty reply from server" error. This happens because local environments do not have a stable public internet connection, and Dropbox requires a publicly accessible server to complete the upload handshake. In this case, back up locally first, then upload to Dropbox manually.
Fix 11: Check for Account Restrictions
In some cases, backup problems may be related to account restrictions. If your account has been suspended or restricted, backup features may not work.
Review any emails from Dropbox for information about account issues. If you believe your account has been restricted in error, contact Dropbox support for assistance.
How to Check Dropbox Backup After Fixes
After completing the troubleshooting steps, you can check whether Dropbox Backup is working properly.
Open the Dropbox application and check the sync error queue. If the queue is empty and files show a green checkmark, backup is working.
You can also open the Dropbox folder on your computer and create a small test file. Allow some time for the file to synchronize, then check your Dropbox account from another supported device or through the Dropbox website.
If the file appears correctly, the Dropbox Backup and synchronization process are likely working as expected.
Common Dropbox Backup Problems
Although Dropbox Backup is generally reliable, users can sometimes experience problems.
Backup stuck on "Preparing"
If backup is stuck on the preparing stage, check for files that are locked or in use. Close any applications that might have a lock on the files. Also check for conflicting cloud storage folders inside the backup range.
External drive not recognized
If your external drive is not recognized, check the connection. Try a different USB port or cable. Make sure the drive is properly formatted and has enough free space.
Backup stopped after unplugging drive
If you unplug an external drive, backup will pause. Reconnect the drive and click Done to resume.
Files not backing up
Check the sync error queue to see which files are stuck. Common causes include file locks, permission problems, unsupported characters in file names, and storage limitations.
Third-party tool authentication failure
If your third-party backup tool cannot connect to Dropbox, refresh the authentication token by disconnecting and reconnecting the tool in its settings.
Tips for a Smooth Dropbox Backup Experience
Keep your internet connection stable during backup. A reliable connection helps Dropbox upload your files without interruption.
Keep your external drive connected if you are backing up from it. Backup will pause if the drive is disconnected.
Avoid moving or deleting synchronized folders without understanding how those changes affect your Dropbox account.
If your computer has limited storage, review your Dropbox file availability settings and keep only the files you regularly need offline.
It is also helpful to use a strong password and enable available security features on your Dropbox account.
Final Thoughts
Fixing Dropbox Backup problems provides a convenient way to protect your important files and keep them accessible across supported devices. The troubleshooting process involves checking the sync error queue, closing locked files, removing conflicting cloud folders, checking external drive connections, and resolving third-party tool issues.
If you experience a backup problem, checking your internet connection, restarting the application, reviewing storage availability, and reconnecting external drives can often help. Once backup is working again, you can use Dropbox for storing, organizing, synchronizing, and protecting your files more conveniently.
With the right configuration and regular updates, Dropbox can become a useful part of your everyday file management workflow.