Disclaimer, I'm not a scientist nor have a degree in any sort of this thesis. This is my personal thinking. If you disagree, you are free to discuss it.

#Saving the Brain Some say to save the brain as it is, which would require more capacity than we have available right now.

So, every server, every HDD or SSD in the world isn't enough to store a brain.

So there's that problem, the other would be transferring this amount of data into a device. So let's say you could save it. How long would it take?

With our current technology, we can transfer "only" 1.84 Pbit/s (source). This is equivalent to 1840 Terrabytes/s or 1'840'000 Gigabytes/s.

Would this be enough to save a brain? We don't know.

#Age of a Brain The second concern is that Alzheimer and cancer are a problem of aging. The longer you live, the higher the chance to get one of these.

So even if we reverse aging and could toggle it on and off (to stay forever at the age we want), it needs to solve those two problems too. If not, we would likely think ourselves to death.