[Uschiekid]

You can also just add previews for the books.

When you borrow from Overdrive on a Kobo, after it expires, the next sync automatically deletes the full copy and downloads the preview as a "placeholder". If you had any annotations, bookmarks, etc, those will be kept with the preview, so if you borrow it again or buy it, those annotations will be still there. Some people choose to delete the preview (if you do, the annotations are irrevocably deleted too)

If you use this method, it means your "historical" book borrowing and your future book borrowing will be the same. If you don't use previews for other purposes (ie as a preview, to decide if you want to buy), then you could also then filter to just previews in your menu and then you'd have a list of all your borrowing history.

edit: if you had many books from other sources, this may be less practical, as you would maybe dislike that a preview was taking up some space on your device, but with your habits and the 8gb (or 32gb) of a forma, it would have to be A LOT of pretty graphic-rich previews to even come close to filling that up.