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You are better off using USB. You have to plug the cable in to charge anyway, and it can charge while you manage with Calibre.
Best to simply save a backup on the NAS when you are not running Calibre.
A 32 G Kobo can store about 18,000 ebooks, or maybe 1000 big comics.
I've used Wireless access to Calibre via web page and via OPDS. The USB solution is better for all USB Mass Storage (non-MTP devices, non-Network only).
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