I write on an old tablet and copy via USB on my PC. This way, I have it on tablet, USB, and PC. Every few months, I also copy on a second USB, and in addition, I have two folders I switch the saves, as I once had the issue that my text-doc was corrupted and I overcopied with it even my good saves.
The problem with Mushoko Tensei is that it's a heavy grey area that I perceive as so dark, one can hardly tell where the line would be crossed. One can't tell if the author is like that, but it's out of the question that he made it a trait for his MC and presents his character as someone to relate to. So to say, the intention is to make us relate to someone attracted to little girls.
I saw the thread and one wrote "If I write about someone killing people, am I a murderer?". And the answer is, it depends. If you write about a racist dude, who openly does race crimes, gets away with them and is celebrated for doing so, then I have my troubles seeing this as a mere coincidence, but a message. If someone writes an LGBTQ story, would we really argue that they're in truth against it? (I mean this as a positive example in the other direction, not to drag down LGBTQ to racism)
Now we have Mushoko Tensei and a very strong focus on sexual things.
That being said, authors shouldn't be directly judged for what they write. As I said, it's a grey area. Hell, even my stories could be considered problematic, and I swear, I'm not really into torturing little girls.
Though, sometimes it can be hard to differentiate story content and intended message. It's not even as simple as saying if there's a general trend of something in the story, as that could be attributed to style. On the other side, maybe not? Of course, the save route is not to judge before there isn't clear evidence. Accusations can destroy lives, even if unfounded. Such weapons should be wielded with care.