How to rename a folder inside a Time Machine backup disk

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3. Dealing with the issue of Time Machine backups having the same name on macOS, especially after an update like Big Sur, can be tricky due to the way Time Machine manages and protects its backup files. Here's a step-by-step guide to help you resolve this issue:

   Precautions

   1. Backup Your Data: Ensure you have a separate backup of your critical data before proceeding.
   2. Avoid Direct Modifications: Directly renaming or modifying Time Machine backups is generally not recommended as it can corrupt the backups.

   Steps to Resolve the Issue

   1. Identify the Correct Backup Disk:

      • Make sure you are clear about which disk and which backup you need to rename.

   2. Disable Time Machine:

      • Go to Apple Menu > System Preferences > Time Machine.
      • Uncheck "Back Up Automatically" or click the "Off" button.

   3. Access Time Machine Backup:

      • Open the Time Machine drive in Finder.
      • You'll find backups are stored in a folder named "Backups.backupdb".

   4. Attempt to Rename the Folder:

      • Right-click on the folder you want to rename and see if the rename option is available.
      • If it's greyed out, this method won't work due to macOS restrictions.
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   5. Use Terminal (If Renaming is Disabled):

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      • Open Terminal.
      • Type the command sudo mv oldname newname, replacing "oldname" and "newname" with the actual names of your folders. Be very careful with this command, as it can lead to data loss if used incorrectly.
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   6. Alternative Approach - Create New Backup:

      • If renaming seems risky or unfeasible, consider creating a new backup for the affected Mac.
      • You can manually copy important data from the old backup to your Mac and then back it up again.
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   7. Re-enable Time Machine:

      • Go back to System Preferences > Time Machine.
      • Turn Time Machine back on.
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   8. Check Backup Integrity:

      • After renaming, ensure your backups are still functional. Attempt to browse them through the Time Machine interface.

   Important Considerations

   • Avoiding Future Conflicts: Ensure your Macs have distinct names (System Preferences > Sharing) to prevent this issue in future backups.
   • External Tools: Some third-party tools claim to manage Time Machine backups, but use them with caution.
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   • Apple Support: If you're uncomfortable with these steps, consider contacting Apple Support for guided assistance.

   This issue is complex because Time Machine is designed to protect its backups from accidental modification, which can sometimes make seemingly simple tasks like renaming a folder more complicated. If you're unsure at any step, it's best to seek professional help to avoid data loss.

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