I think it's impossible to retain the amount of information we consume.
I've personally given up and if I remember, that's great, if I don't, oh well. There is always more to learn tomorrow.
At the end of the day some of this information is most likely lodged in your brain and the digital version can be discarded. However some of it should be retained manually in some system - or at least I feel it should.
What approaches do people use to consolidate and store this information to allow all tabs etc to be closed for the next work day?