I love termux. The only negative I can say is that I think touch keyboards are a bit awkward doing terminal work. (note that termux has a few hidden shortcuts such as when holding volume up wasd becomes arrow keys etc.)

I use the termux widget to give me one-click access to a bunch of rsync over ssh commands. It is the best backup solution for android I've ever come across (this can also be automated with apps such as tasker or automate). Using rsync I also have two-way syncing for some folders so that I can easily put a file I want on my phone on my nas and then just sync it.

I always felt the rsync apps on the play store to be extremely clunky and when not wanting to go through a cloud the alternatives are limited. But this works perfectly.

edit: Also, being able to SSH into my phone and manipulate using a real keyboard and bigger screen is quite pleasant.