Partition management

When we reinstalled XP three weeks ago we also repartitionated our 2 physical harddisks and devided this two into 5 different partitions with the
"Paragon Partition Manager 11 SE Personal"

This tool is pretty much the best in this sector and so sophisticated,you can occupy yourself quite a while with it.:)

Now i would like to part a existing partition further to install the Ubuntu on it.The Paragon does this of course too,but i'm a bit concerned about my existing files on this partition anyway.:)
It's written in PC magazines that the Paragon does it without data loss,but when i tried,he gave me a urgent warning that i schould backup my files before!?!

Life is not easy.