At the top level of every volume use for normal file storage is a hidden folder containing its version database. Here are details of how it works, and how to solve its problems and get the best from it. Even if you don’t want to use versions.
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Now supported by many apps, document versions are a free and valuable feature in macOS. Here’s a summary of its features and how to get most from it.
Although problems are rare, solutions are very limited. How to test the version system, and the few things you can do to fix it.
The Eclectic Light Company 