Dupe guide

Duplicates left over from a Time Machine restore on Mac

A partial Time Machine restore can leave you with two copies of every file. Here's how to clean up safely.

4 min read

Time Machine restores aren’t always clean. Maybe you restored a folder to recover one file and ended up with two copies of everything else. Maybe you migrated from a backup but your current Mac already had some of the same files. Either way, you’ve got a lot of side-by-side duplicates — same content, different folders.

Survey what happened

Before deduping, get a sense of the damage:

  1. Open Finder and navigate to where you restored files. Often this is a Restored Items folder on the Desktop or in your home folder.
  2. Note its size in Get Info (Cmd+I).
  3. Compare against the folders where the originals already lived (Documents, Pictures, etc.).
  4. If the restore folder is large and you’ve already got the same content elsewhere, dedupe.

Dedupe across the restore and your existing files

  1. Download Dupe and open it.
  2. Click “Add Folder” and add both the restored folder and your existing folders (Documents, Pictures, Desktop, etc.).
  3. Click “Scan.” SHA-256 hashes catch any byte-identical files regardless of folder.
  4. Review duplicate groups. Each group shows paths so you can see which copy is the “old” original and which is the freshly restored one.
  5. Decide which to keep. Usually you want to keep the existing-folder copy (it’s where your apps look for the file) and trash the restore-folder copy. Dupe lets you sort and select by folder.
  6. Click “Move to Trash.”

A note about choosing which copy to keep: if you restored because the existing file was corrupted, you might want the opposite — keep the restored copy and trash the original. Dupe shows file size, modification date, and full path so you can make that call per group.

After cleanup

Once duplicates are gone, you can usually delete the empty parts of the restore folder. Some restore folders also include a metadata folder Time Machine creates (.com.apple.timemachine.donotpresent); those are safe to delete from a restore destination on your Mac, though Dupe won’t touch them on the backup drive itself.

Safety

For most restores, one pass cleans up the duplication and lets you delete the restore folder entirely.

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