How to save kwrite backup~ files to a backup directory?

[Josef Lowder]

.
When using the kwrite editor, it makes backup duplicate files 
in the same directory as the original (creating a lot of clutter). 

How can I configure kwrite to send all backup files to a different 
place, i.e. /usr/tmp or /home/joe/backups ?? 

In the kwrite configuration file open/save option, I tried 
to put /home/joe/backups/ in as a prefix, but that did not work.