How serious a loss was the burning of the Library of Alexandria to human knowledge? : AskHistorians

I know this is a pretty open-ended question, but I think what I’m really trying to get at is whether the meme of a tragic and dramatic blow to the stockpile of accumulated human knowledge is really accurate, whether it’s accurate in a limited context (i.e. it sucked for Greece but didn’t matter much in the long run), or whether it’s a total myth and really nothing too critical or unique was lost due to duplication/transportation/etc.

From How serious a loss was the burning of the Library of Alexandria to human knowledge? REddit : AskHistorians