This post is entirely about uploading. If you reject the idea of uploading and prefer to instead be revived biologically, then you might as well stop reading right now.
I've always claimed that an upload would require slicing the brain up into billions of pieces and meticulously scanning them. All the sci-fi uploads based on some sort of helmet are just technobabble. But I've recently come up with a few likely scenarios for something non-destructive that could be done sooner. One scenario starts with Brain-computer Interfaces (BCIs). Let's say BCIs get very popular and advanced. This would include on the surface of the brain as well as within larger veins. As you use your BCI daily, the software would need to run an emulation of your brain in order to know how to interact with it. As the BCI started snaking deeper into your veins and covering more of the surface of your brain, the emulation could get pretty good. It would be trivial to run that emulation in a separate environment to compare it to the original mind. Somehow, it could be possible to validate that it really does think pretty much like the original. Once that happened, I guarantee that some early adopters will jump ship and go full digital. They would chemically fix their original brain and then harvest more information out of it later after technology improved.
Let's take it a step further. Let's say BCIs never really get developed. It should be possible to start with DNA and a personal history and derive a brain emulation from that. Much of how you think is just genetic. At some point, probably long before mature BCIs, we should be able to create fairly decent emulations of people. So now you're old and you have this emulation that is getting gradually better. You might very well decide to set up a legal structure to let that emulation take over when you die. Yes, you would loose a huge amount of information in the process, but it would only be temporary. The new you could later harvest all the memories from the old you and re-integrate them.
Yes, I'm well aware that most people reading this would have no interest in doing what I suggest, but people in the future will have much less hesitation because they will have daily experience with advanced emulations, VR environments, robot avatars, etc. It won't feel nearly as scary to them and they will likely be very pragmatic about it. I suspect that a lot of people will simply transfer their assets to their emulation when they die with the full expectation of recovering the lost memories in the near future.