I seldom sync to Kobo since I never make purchases through my reader. I only shop for ebooks through my PC and then sideload to the reader. My wishlist is even empty since I don't like seeing all the extras. The options for recommendation and previews, do you mean within the Kobo store? or an option somewhere in Calibre? If you mean in the Kobo store, would that increase the metadata.calibre file size?
I have 3 extra columns set up in Calibre for dates read and re-read and which books are on my readers (since I have 6 readers now, I usually keep all the same books on them), and then 2 columns from the page count plugin for pages and words. But how would that create a larger file on the reader, is that info somehow also transferred to metadata.calibre file on the reader?
I just let the reader sync and after downloading dictionaries and then new software, the reader locked up so I had to do a soft reset with a paperclip. Nothing got erased, I deleted the downloaded firmware update (maybe I forgot to change the file, or it reverted, not sure which), and the metadata.calibre is remaining around 2MB.
And it's happily still not giving me any communication errors, Calibre is still deleting and transferring books multiple times during each connection without any glitches.
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