Just an idea that you may export it to TIFF using Reportlistener. I used to print the report to PDF file for backup, however, it requires to have PDF printer driver, which is from Scansoft PaperPort, however, the license is limited... I have looked other pdf driver, which is either needed to pay or difficult to use with...

However, by using TIFF, the file size is increased 20% only, it is quite acceptable in Today's harddisk storage... especially if backup is done in compressed volume