Searches have revealed a bunch of threads related to the
official warning not to use Google Drive for Calibre libraries. They're all pretty old and it looks to me like the advice might be out of date.
As far as I understand it, the issues related to GDrive mangling filenames with parentheses. I've created several dummy files in my GDrive, with parentheses in the main part of the filename, in the extension, with and without containing spaces etc. So far they've survived syncs and file edits intact.
Does anyone know if the official advice not to use Google Drive is out of date, or are there edge cases that simple testing doesn't reveal?