Barns are one of my favorite subjects to shoot.
Well it is not humans because we never landed on the moon... (adjusts foil hat). Seriously though people can see all kinds of things that are not there like the man in the moon.
I bracket all the time and know what I am doing. I want the full dynamic range which you will never get with a single shot. If all I wanted was a single shot I would use auto mode to make the settings for me.
I always bring a laptop and never entrust my images to a cloud. Memory cards are cheap so on long trips I bring lots of them and swap them out when full. Yes cards can and do fail but so can every storage device. I never put all my eggs in one basket for this reason.
The majority of powerful photographs are the ones that unite both the heats and minds of the viewer. It is the picture that their imaginations keep returning to, keeps their attention focused, and keeps asking about; the image that touches them on an emotional level; the image that draws them into the scene, if only for a brief while. That engagement is what binds us to the scene of the photograph, it's what seizes our spirit and won't let us leave. The image connects on a more personable level.
The image must speak to the viewer; the image must have something to tell. Without that it is just another snapshot.
Mastering use of your camera won't help with this. This is the part of the Photographic journey that is done with your heart and soul, because it's the heart and soul to which we speak on the other side of the photograph. This is what makes a great photograph imo.
Do not get a threaded filter the last thing you want is to miss the beginning of totality by unscrewing a filter from the lens. You only have at best 150 sec to capture it. Get one that will slip off quickly. Also practice the routine so it becomes second nature to you.
If you need a room you should have already booked one. I had to settle for one 3 hrs from totality and booked one a month ago.