[vincentkriek]

Kobo Sync as it's called in the documentation (https://github.com/janeczku/calibre-web/wiki/Kobo-Integratio...) works very well, and is very easily enabled (updating a single line in a config file on the ereader that appears when you mount it on your computer).

It will convert books to Kepub automatically and you can select to only sync certain shelfs.