Quote:
Originally Posted by Akshayy
Your hard disks will die over time, you will have to keep making backups. I have this issue with 100gbs of my pictures, losing a few every year.
Instead I recommend you dump them on the cloud  , dropbox, google drive for example...
Best buy only real books!! no drm, no need to worry about resolution, battery life, no tech distractions, lasts forever if handled correctly! 
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As far as hard disks go, I stagger them -- load everything to the next drive after 2.5 years and mirror them, in another 2.5 get rid of the first buy new one and do the same, etc.
Although, honestly, ebook files are so miniscule I also keep a few extra copies of my library on spare SD cards. I have hundreds and have come nowhere near filling some old 2 GB SD cards I had leftover from my first digital camera. The biggest danger to an SD card is writing and re-writing, which I don't do with my archives. (The SD Association claims an expected lifespan of 10 years or more.)
As far as "real books" go -- you're right only if your books were printed on acid-free archival materials. Go to a used book store and check out the effects of yellowing, foxing, mold, mildew, silverfish, book worms, etc.