Resolution for macOS scanning incomplete error:-1011 (API request impossible)

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On Retrospect 15 for Mac, if you are doing a backup of a SMB/AFP share and encounter the error "Scanning incomplete, error -1,011 (API request impossible)", please follow these steps to resolve the issue:

1. Open "System Preferences" > "Retrospect" and stop the Retrospect engine.
2. Open /Library/Application Support/Retrospect/retro.ini with a text editor.
3. Locate the "[Options]" entry and add the following line directly underneath of it:

FileSystemApi=2

1. Save the retro.ini file.
2. Open "System Preferences" > "Retrospect" and start the Retrospect engine.
3. Restart your backup or copy. The issue should be resolved.

Last Update: March 21, 2018