First of all, humans have already solved this problem successfully with the invention of oral traditions. If you combine a stubborn social practice with a sufficiently effective and fault tolerant stenography, you should have storage that can reach 50K years (Australian aboriginals boast 60K+ years of records). IOW a record keeping written language and a social practice (like a religion) would have the practical survivability of oral traditions but a much higher storage capacity.
Second, and perhaps this should be first, why are we assuming our knowledge is even remotely relevant to the distant futures? Absolutely none of Ancient Egyptian science exists as practice today, their entire cultural horizon is dead (a corpse in Nietzschean terms) and the only ones with a devoted interest are an elite few in a science of archeology that has only existed once in humankind to our knowledge. That the future cultures have the social or biologic capacity or motivation for archeology let alone science rest upon some rather huge and unfounded assumptions.
The only thing I can think of that should be transferred 1000 years into the future which they also have a high probability of caring about regardless of what motivates them would be e.g. where we store nuclear waste.