What do you use for taking notes in corp environment where data security is hard requirement and using 3rd party online solution (or the one that requires you t

What do you use for taking notes in corp environment where data security is hard requirement and using 3rd party online solution (or the one that requires you to open an account for)? So far I'm stuck with offline solution (cherrytree, I'm with them since using Linux back in the day) which is not ideal but gets me going. Also it's relatively easy to make scheduled backups to internal servers where I can retrieve them in case of laptop failure and/or migration to new hardware. Not saying I really need to use other software than cherrytree but would like to try something else (you know, that itchy feel in the back of your brain). Any good offline solution anyone would recommend?