Problem to save local setting after config kmine

Hi All
Have you some tips for this issue ???

Scenario
Knoppix on Cd rom - A persisten home on hda2 - a config information saved on hda2

I have shaped KMail for read my email from a MS Exchange server with SNMP protocol for send email and IMAP protocol for connect the exchange server and send email. All work correctly.

Issue
When I try to Save Knoppix configuration at the 97% of the saving (Saving configuration archive) I catch the error
""The KNOPPIX configuration could NOT be saved tar:
/home/knoppix/.kde/share/apps/kmail/myMSdomain\myNTaccount\MyName_MySurname\:@exchange server\:110: Cannot stat: No such file or directory tar: Error exit delayed from previous error""

Any idea thank you !

:cry: Is it possible that nobody has experience with this problem or can help me in the troubleshooting of this issues ??