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Dropbox Backup is a powerful feature that automatically protects your important files by creating a copy in the cloud. However, users sometimes encounter errors that prevent backups from completing successfully. These errors can range from authentication failures to file conflicts and storage limitations. This simple guidance explains the most common Dropbox Backup errors and provides practical solutions to resolve them.
What Is Dropbox Backup?
Dropbox Backup automatically backs up folders on your computer or external drive to your Dropbox account. It ensures your important documents, photos, and other files are safely stored in the cloud, protecting them from hardware failure, accidental deletion, or theft. The feature is available on Dropbox Plus, Professional, and Business plans.
Common Dropbox Backup Errors and How to Fix Them
Error 1: "Dropbox Backup Has Stopped Working"
If you see a message indicating that Dropbox Backup has stopped working, this is one of the most common errors users encounter.
What to do:
Sign out and sign back in to the Dropbox desktop app. This resets the backup configuration and often resolves the issue. After signing back in, you will need to set up the backup again to continue protecting your files.
If you are backing up an external drive, unplug the drive and plug it back in, then start the setup process again.
Important note: If you choose not to take any action, you can still access your existing backups through the Dropbox website, but the backup will no longer update.
Error 2: "There Was an Issue with Your Backup"
If you receive an error message about an issue with your backup, this typically means Dropbox stopped the original backup due to a technical problem and created a new one.
What to do:
Your files are safe. The new backup will have "(New)" or a number at the end of its name (for example, "MyDrive(1)") and will function the same as the original.
Any changes you make to your computer or drive will only be reflected in the new backup. The new backup starts with a fresh version history. If you want to keep the original version history, you can keep the old backup.
Before deleting the old backup to free up space, check that all the files you need are in the new backup. If any files are missing from the new backup but present in the old one, download them before deleting the old backup.
Error 3: Backup Setup Shows an Error
If you encounter an error while setting up backup, several issues could be responsible. Dropbox provides specific troubleshooting steps for setup errors.
What to do:
Close any files or applications that are using data from the folders you want to back up. If a document is open in Word or Excel, Dropbox cannot back it up until you close it.
Remove other cloud storage folders (such as iCloud, OneDrive, or Google Backup and Sync) from the folders you are backing up. Ensure your files are restored to their original folders on your computer before proceeding.
Make sure you have edit permissions on all files and folders you want to back up. If the folder is not in its original default location, move it back.
If your Dropbox folder and the folder you want to back up are on different hard drives, move them to the same hard drive. For example, if your folder is on an external drive but the Dropbox folder is on your computer's internal drive, move them together.
Error 4: Folders Named "ToolKit" and "FileHistory" Are Not Backed Up
Folders with these specific names are not backed up by default because their names can cause technical problems.
What to do:
If you need to back up these folders, rename them to something else before adding them to your backup.
Error 5: Authentication Errors
Third-party backup tools that upload to Dropbox may fail with authentication errors. The error message often says "You are not authenticated with Dropbox" or "invalid_access_token".
What to do:
Refresh the Dropbox authentication token in your backup tool. Go to the tool's settings, find the Dropbox connection option, disconnect it, and reconnect by completing the browser authorization flow.
If you use UpdraftPlus, go to Settings → Choose your remote storage → Dropbox, and disconnect and reconnect using the same Dropbox account.
Check whether multiple app folders exist in your Dropbox account or whether the app folder has been moved or renamed. Backup tools rely on a specific app folder, and if it is altered, the tool cannot list files correctly.
Error 6: File Size Mismatch or "Not Enough Space"
If you see errors about file size mismatch or insufficient space, the upload to Dropbox may have been interrupted.
What to do:
Check your Dropbox storage space. If your account is full, backup will stop until you free up space or upgrade your plan.
For third-party tools like BackWPup, try changing the archive format from ZIP to TAR.GZ. TAR.GZ uses fewer server resources and is less likely to time out during compression.
Adjust the "Maximum script execution time" in your backup tool's settings to around 20-25 seconds to prevent timeouts.
Error 7: Backup Stuck or Stalled
If backup appears stuck on "Preparing" or at a certain percentage, several factors could be responsible.
What to do:
Check the sync error queue in Dropbox. Click the Dropbox icon in your taskbar or menu bar, click your avatar, and select "View sync issues." Failed files will appear here, showing you exactly what is stuck and why.
If you are on a Mac and backup is stalled on ".dbxignore," delete the .dbxignore files. These are placeholder files created by Dropbox. Users have reported that deleting them unsticks the backup process.
If backup is stuck on a .canary file, exclude the Dropbox cache folder from your backup. The .dropbox.cache folder indicates pending synchronization.
Restart the Dropbox application. Completely quit Dropbox and relaunch it.
How to Prevent Dropbox Backup Errors
Keep your internet connection stable during backup. A reliable connection helps Dropbox upload files without interruption.
Keep external drives connected if you are backing up from them. Backup will pause if the drive is disconnected.
Before setting up backup, close all open files and applications on your computer. This prevents file lock conflicts.
If you use other cloud storage services like iCloud or OneDrive, disable their backup features before using Dropbox Backup to prevent conflicts.
Final Thoughts
Dropbox Backup errors can be frustrating, but most have straightforward solutions. The key steps are checking the sync error queue for specific file issues, ensuring files are not locked by other applications, removing conflicting cloud storage folders, and refreshing authentication tokens for third-party tools. If errors persist, signing out and back in to the Dropbox app often resolves underlying configuration issues. With these troubleshooting steps, you can get your backup working again and keep your important files protected.