Even the on line demo does not work.
The setup is to copy files to a folder and run
I set the permissions on the txt file to 777 to make them writable
but the script just does not work.
I suggest you browse hostscripts.com for another script.
A quick way to back up a database
is from cpanel > backup > download database ( a compressed file )
If there is a problem later you can upload it back in the same place.
I found this one from google
http://www.pdf995.com/
PdfEdit995 offers a wealth of additional functionality, such as: combining documents into a single PDF; automatic link insertion; hierarchical bookmark insertion; PDF conversion to formatted HTML