Problem with Backup WinCE and Assets

Hi,

I am not able to complete the execution of the BootBlaster3900-2.6 on my
5450. The backup of the Bootldr seemed to work fine but the backup of
WinCE stops with an error.

To me, it seems that there is not enough space on the device to store
the whole WinCE.gz file (although I removed all programs and data I
could). In fact, the backup part says it will require 47 Mb of space. I
would like to save the WinCE.gz on an external SD/CF card but the
application does not seem to support it. I tried to rename my SD card as
the "My Documents" directory but it does not work. 

Any ideas on how I can successfully backup my WinCE?

Hope this is the right place to ask this question.

Thanks,

Francois.