First of all, these are basically incompatible devices. There is little these two have in common. There are some things that the Tungsten does that the 270 cannot. So I would suggest not backing it up with the Tungsten stuff. If possible, download the Palm desktop that is compatible with the 270 from the Palm website, the link to the general page for that device is:
http://www.palm.com/us/support/treo/treo270/
With the 270 you are basically starting from scratch. I found with the 300 that I had there were many programs that it would not run.
Good luck. Ben