Thank you Richard for your response ..
thats what i`m saying files should be no difference with CEntos than Fedora ..
but as i excepted troubles caused by configuration files mess which happened by 
re installing the software.
i re installed the software one more time after i did "rm -rf /etc/BackupPC" to 
make sure its a clean installation
and it went good for setting up the backuppc user`s password using . .

$ htpasswd -c /var/lib/backuppc/passwd/htpasswd backuppc

but i still can`t access the Panel from the GUI with http://localhost/BackupPC
with the pre created user: backuppc , and password: backup
after i insert my Credentials it keeps prompt for them endlessly !  
what could be wrong then ?
----------------------------------------------
$ cat /etc/httpd/con.d/BackupPC.conf
-----------------------------------------------
<Directory       /usr/share/BackupPC/sbin/>
# BackupPC requires valid authentication in order for the web interface to
# function properly.  One can view the web interface without authentication
# though all functionality is disabled.
#
# htpasswd -c /etc/BackupPC/apache.users yourusername
#

order deny,allow
deny from all
allow from all
AuthType Basic
AuthUserFile /etc/BackupPC/apache.users
AuthName "BackupPC

require valid-user

</Directory>
--------------------------------------------
$ ls /etc/BackupPC/
---------------------------------------------
config.pl  config.pl.back  hosts  pc
-------------------------------------------------


Disperate for help to start BackupPC in Production Environment .. any help ?
 :(

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