I do a Ctrl-A to select the entire messages then do a Ctrl-C and save it to clipboard before I post a lengthy message on Pprune. Autosave doesn't work for me for reasons unknown. Often I lose a message because I take forever to type it due to distractions and Pprune expires my session which I only discover after hitting the submit button.
A few days ago the R&N thread became private to my account meaning I cannot read it when logged in but can read it when logged out. Bizarre, but I usually have my posts deleted there for reasons unknown. Pprune is someone else's bat and ball so I really couldn't care what rules they play with.