No. The plugins dont access the server. The plugins themselves are updated from the server. This is true for most parts of calibre that have to scrape websites, such as the recipes, get books and metadata download.
This is done so that calibre continues to work for its users when the websites change without needing to continually upgrade calibre itself.
And if the calibre server is ever down, all that will happen is the plugins will not update themselves any more. And wil linstead be updated when you update calibre.
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