Welcome to the OptoForums! Lots of options for reading/writing to a text file. Check out [this thread and also this [URL="http://www.opto22.com/community/showthread.php?t=673"][U]comm handles 101 post[/U]](http://www.opto22.com/community/showthread.php?t=322).
However, I'm not sure I understand your concern about "FTPing a temp file" -- could you tell us a little more about what you're trying to do?
I'm guessing from what you've mentioned so far that writing to the sd card in your R2 would be your best bet (now up to 32G w/R9.4a firmware), but that's based on some assumptions. Can you tell us more?