Will the electronic data be available even 20 years down the road? My sister works for a company, and they have everything stored electronically. They switched systems 2 years ago, and it wasn't until a year after they switched that they realized that they couldn't access data that was generated before the switch.... It cost them some $$ to access the data.
I think a differentiation must be made between data (that can be both software specific and or machine platform specific) and PDF files which are not as sensitive to either software or operating system platforms. Dwight (or any other of our more tech-savvy members) could probably address this much better than I.