YMMV. I probably have more books and documents than I will ever read. I use Calibre to manage this collection. It is easier to flip through my collection of books on a computer when deciding what to read next than on my ereader. Being able to download meta data helps me decide what to read next. I use the Calibre storage as my backup for my ebooks. My first ereader was a Kindle which I stupidly trashed while trying to swat a fly (true story). I then bought a Kobo. Calibre converted my books as I loaded them onto Kobo.