↑ ↑ ↑ ✔️
Read the last item in the calibre FAQ Library Management section, snippet:
Quote:
<snip>
If you are using a file-syncing tool it is essential that you make sure that both calibre and the file syncing tool do not try to access the calibre library at the same time. In other words, do not run the file syncing tool and calibre at the same time.
<snip>
In particular, be aware that Google Drive is incompatible with calibre, if you put your calibre library in Google Drive, you will suffer data loss.
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