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Code42 Support

Destination unavailable

Available in:

  • CrashPlan PRO
    • Standard
    • Premium
    • Enterprise
Applies to:


When a destination is unavailable, the Code42 app displays one of the causes listed below:

  • Archive missing
  • Backup schedule
  • Under maintenance
  • Not recognized

Review the troubleshooting information below for the message you received.

Archive missing

If an external drive destination is unavailable, the Code42 app displays the message "Archive missing - Backup location is not accessible." This error typically appears because the drive name or letter may have changed. See the common cause and solution below for your operating system.


By default, Windows does not assign a static drive letter to external drives. For instance, if a drive named D:\ is ejected from the device and then reconnected, it may be assigned a different drive letter. If the drive letter changes, the Code42 app won't recognize the drive because it's still looking for the old drive letter.

To determine if the drive letter changed:

  1. Open the Code42 app.
  2. Go to device preferences:
    • Windows: Select View > Options
    • OS X: Select CrashPlan > Device Preferences
  3. From the list of existing destinations, select the local destination.
  4. Note the letter that the Code42 app expects for your external drive.
  5. Open a file browser.
  6. Click Computers in the left panel.
  7. Compare the letter currently assigned to your drive with the letter the Code42 app has associated with the drive.

If the letters are different, assign the drive a static drive letter using the original drive letter to correct the issue.


If an external drive stops backing up on OS X, it is likely because the drive didn't unmount cleanly (for example, after a power outage, or disconnection without ejection). When this happens, the drive can leave behind a "ghost" folder in /Volumes, even though the drive is no longer mounted. When the external drive re-mounts to your device, the "ghost" folder name is already taken, so your device adds a “1” to the external drive's name. However, the Code42 app looks for a folder with the original name, and that folder belongs to a drive that appears to be no longer connected. Use our troubleshooting guide to diagnose and correct this issue.

Backup schedule

The "Backup Scheduled - Backup scheduled to begin at X" message displays when the Code42 app is set to run between certain hours and it is outside that time period. To adjust the times that the Code42 app is able to run:

  1. Open the Code42 app.
  2. Select Details.
  3. Click the backup set settings button.
  4. Next to Backup Schedule, select Change.
  5. Adjust your backup schedule as needed.
These steps assume you have permission to change your backup schedule. Your administrator may prevent editing of this setting.

Under maintenance

If you see the message, "Routine maintenance - Backup will resume automatically when maintenance completes", the destination is currently performing archive maintenance. Archive maintenance is a normal part of the Code42 app's operation. Backup will resume and the message will disappear once the maintenance process completes.

Not recognized

The "Not recognized - The destination does not recognize this device" message appears when a destination cannot successfully communicate with the Code42 app.

To reauthorize with your destination:

  1. Open the Code42 app.
  2. If necessary, sign in.
  3. Open Code42 Commands by entering the keyboard shortcut for your operating system:
    • Windows: Enter Ctrl+shift+C
    • OS X: Enter Option+Command+C
  4. Enter this command: deauthorize
    You are signed out of the Code42 app.
  5. Sign in again to the Code42 app.

Contact your administrator if you are still unable to back up to the destination after reauthorizing.

Deauthorizing in Code42 for Enterprise
Code42 for Enterprise administrators can also deauthorize devices from the administration console. The user must still sign in to the Code42 app to reauthorize.