How to use external drive as onedrive location on Mac

Follow https://techcommunity.microsoft.com/blog/onedriveblog/onedrive-for-mac-now-supports-removable-drives/4419685

There are a few requirements your system must meet to use this feature:

• You’ll need version 25.127 or later of OneDrive.
• You also need to be running macOS 15.0 or later.
• The drive you select must meet the following requirements:
  • Formatted for APFS
    • Protected by FileVault (see below for instructions)
      • Not read-only, a network drive, or marked as quarantined by macOS.

Just like before, you'll need to manually set up a new sync relationship on the new drive. Sync settings won't transfer automatically.

You cannot use OneDrive by moving your external drive between Macs; you must set up OneDrive again on each new Mac with the external drive.

To protect a drive with FileVault:

1. Format the drive for case-insensitive APFS, if it is not already.
2. Find the drive in the Finder.
3. Option/right click the drive and choose Encrypt.
4. Follow the prompts.

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hth

Marcin