Only you can’t copy it if it’s in the middle of a transaction or you corrupt it and have to roll back the Journal. And coping the journal, WAL, and DB itself directly and trying to backup from that isn’t recommended. In fact SQLite itself has a purpose built backup API.

https://www.unixsheikh.com/articles/sqlite-the-only-database...

Yes, technically a SQLite database is just a file on disk. And for the most part, you can treat it like other files on disk. Except for when you can’t. The GP’s questions are valid