Posted on by Mac User

Error code: 92 in Time Machine

If you’re seeing Error Code 92 related to Time Machine (Apple’s macOS backup system), it generally refers to a problem with mounting or accessing the backup disk. This can happen when:

  • The backup disk is not connected properly.
  • The disk is corrupted.
  • The backup image is damaged.
  • There are permission or file system issues.

How do we fix Time Machine Error Code 92

Here’s a step-by-step guide to troubleshoot and fix it:

Check the Disk Connection

  • If it’s an external drive (USB, Thunderbolt):
    • Unplug and replug it.
    • Try a different port or cable.
    • Check if it mounts in Finder or Disk Utility.
  • If it’s a network drive (e.g., Time Capsule or NAS):
    • Ensure you’re connected to the correct network.
    • Reboot the network drive and your Mac.

Open Disk Utility and Run First Aid

  1. Go to Applications > Utilities > Disk Utility
  2. Select the backup drive.
  3. Click First Aid.
  4. Let it complete the scan and repair.

Manually Mount the Sparsebundle (if using network backup)

If you’re backing up over the network:

  1. Open Finder > Go > Connect to Server
  2. Enter the network path (e.g., afp://TimeCapsule.local or smb://192.168.0.1)
  3. Manually mount the .sparsebundle image from the disk.
  4. Try running Time Machine again.

Delete Incomplete/Incompatible Backups (last resort)

Sometimes an incomplete or corrupted backup file causes the error.

WARNING: Only do this if you’re okay with losing the most recent backup.

  1. Navigate to your Time Machine drive.
  2. Go to the Backups.backupdb folder.
  3. Find the latest (or broken) backup folder and move it to Trash.
  4. Try Time Machine again.

Reset Time Machine

  1. Open System Settings > Time Machine
  2. Remove the current backup disk.
  3. Re-add the backup disk.

Add New Time Machine Backup

  1. Plug in a new drive (Spare Drive no data)
  2. Format (erase) the drive in Disk Utility as Mac OS Extended (Journaled)
  3. Select new drive (Spare) as New Time Machine Backup. When asked to keep existing backup click yes.
  4. Start backup

Still not working?

Most likely there is some software or hardware issue on the machine. Without further investigating I would recommend if possible clone the drive to a spare drive and factory reset the Mac and restore from the clone.

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Related Article from the Apple Community click here.