As a rule I keep wifi off and never sync at all. When I buy a new book I download it to ADE and add it to Calibre and then immediately archive it. So, normally, the only books that stay on the My Books page at the Kobo site are pre-orders. No books get downloaded automatically and that's the way I like it.
To be honest, in my testing I didn't pay much attention to syncing behavior because I've never cared about syncing. I unarchived a few books and synced just so I could get a few books onto the Forma for the purpose of testing the Forma itself without bringing a computer or Calibre into the equation. I was surprised that the previously downloaded books disappeared after a soft reset though.
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