Apple Time Machine Error Code backupd-70: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
backupd-70
Brand
Apple
Product Type
operating_system
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Apple Time Machine error code backupd-70 means that macOS was unable to complete a backup to your designated backup drive. This typically happens when the backup destination is unavailable, the backup disk has become corrupted or full, or there is a communication problem between your Mac and the backup volume. Although rated medium severity, this error should be resolved promptly because leaving it unaddressed means your data is no longer being protected by automatic backups.
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Tools You'll Need

How to Fix Error Code backupd-70

  1. Check Your Backup Disk Connection

    Never forcefully remove a drive that is actively being accessed. Always eject it safely from Finder before disconnecting.

  2. Restart Your Mac and the Backup Drive

  3. Verify the Backup Disk Has Enough Free Space

    Deleting old backups is permanent. Only remove backups you no longer need. Never delete your most recent backup until a new successful one has been created.

  4. Run First Aid on the Backup Disk

    Do not interrupt First Aid once it has started, as this could cause additional disk errors.

  5. Delete the In-Progress Backup File (.inProgress)

    Use the Terminal 'rm' command with caution. Double-check the file path before pressing Enter to avoid deleting unintended files.

  6. Remove and Re-add the Backup Destination

  7. Reset the Time Machine Preferences File

    You will need administrator credentials to run this command. This step removes your Time Machine configuration, so you will need to re-select your backup disk afterward.

  8. Update macOS to the Latest Version

    Always back up your data before installing a macOS update. Since Time Machine is currently failing, consider using a different backup method such as copying important files to another drive before updating.

Parts You May Need

External hard drive or SSD
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External hard drive or SSD
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When to Call a Professional

If Disk Utility's First Aid reports errors it cannot repair, your backup drive may be physically failing and should be evaluated or replaced by a qualified technician or data recovery specialist. If the error persists after completing all steps above, or if your Mac itself is experiencing frequent crashes or kernel panics alongside this error, contact Apple Support or visit an Apple Authorized Service Provider. If you suspect data loss has already occurred, do not attempt further DIY repairs — consult a professional data recovery service immediately to maximize the chance of recovering your files.

Frequently Asked Questions

What does Apple Time Machine error backupd-70 mean?
Error backupd-70 means that the Time Machine backup process (called 'backupd') was unable to complete a backup to your selected backup destination. This can be caused by a disconnected or full backup drive, a corrupted disk or backup file, a network connectivity issue, or a misconfigured Time Machine preference file.
Will I lose my existing backups if I fix backupd-70?
In most cases, no. The majority of fixes for backupd-70 — such as restarting, running First Aid, or resetting the Time Machine preferences file — do not delete your existing backup data. The one exception is if your drive is physically failing, in which case data may already be at risk regardless of the error code. Always verify your backup drive is healthy before relying on it.
How do I find the backupd-70 error in macOS logs?
Open the Console app from Applications > Utilities > Console. In the search bar, type 'backupd' to filter for Time Machine log entries. You will see timestamped entries explaining exactly why each backup attempt failed, which can help pinpoint whether the issue is disk-related, network-related, or something else.
Can a full backup drive cause error backupd-70?
Yes. If your Time Machine backup drive is completely full and macOS is unable to delete older backups automatically, new backups will fail and can produce the backupd-70 error. Check the available space on your backup drive in Finder by right-clicking the drive and selecting 'Get Info'. If it is nearly full, manually delete old backup snapshots using the 'tmutil delete' command in Terminal.
Is Time Machine error backupd-70 the same as a hardware failure?
Not necessarily. Backupd-70 is a general backup failure code and can result from many software-level causes such as corrupted preference files, incomplete backup sessions, or network issues. However, it can also indicate that the backup drive has file system errors or is beginning to fail physically. Running Disk Utility's First Aid on the backup drive is the best way to rule out hardware problems. If First Aid finds errors it cannot fix, treat it as a potential hardware issue and replace the drive.

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