Data Export missing hidden columns

Hi there, I just performed a data export from my Account Settings page, but when I unzipped and browsed the files I noticed that data from hidden columns is not exported. In my case, I have a “Notes” column that only appears in expanded view

I’ve unhidden the column, but now I can’t export again due to the “1 export per day” limitation

Is this the expected behaviour, and is there any way for me to backup my data?