i use Sony & have read in other threads that retrieving/backing up notes from that is a nightmare.
The concept of being able to pull notes/annotations into calibre library from e-reader is very attractive , but may not be that easy to code.
I think the showstopper will be how notes are linked to book; i do know that if i edit a book in sigil & resend to sony then the notes no longer sync & I get invalid page errors.
AFAIK these is no spec for how to maintain book notes/annotations & thus no obvious way for these to survive book edits ? ideally the notes would have to be stored "inside" the book
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