Thanks for your information
I wanted to know this because my internet connection isn't really fast, so uploading more than 2GB to my FTP server would take a while.
Of course I'll encrypt my wallet.dat with truecrypt.
@RodeoX the idea with stegonography sound very interesting. Can you explain more? How it works? How can I do it?

Hello at all,
I have a question about the backup of my wallet.
Should I backup all files in the bitcoin folder or is it only necessary to backup the wallet.dat?
Thanks for your answers
Cheers,
Quirlich