Definitely - physical copies need to be stored in library's around the world.
Paper/Papyrus seems to last well, if cared for but are there better things we can do today (Difficult to prove without a few thousand years to test). If we have an event that retrogrades our knowledge base all the on-line, on CD, hard drive becomes inaccessible. Even language may change, that's why it's even more important that the Oxford dictionary has physical form as it would be a lexicon to translating other works.
Yes to on-line, and good for them if they make money as it must cost a lot to produce, but only if there are many archived physical copes also made around the world. If these are few they they need to be in a form that is as secure against time and loss of knowledge as possible. (off top of head, laser cut into stainless steel or even better platinum)