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 another version/arch of the software.
i re installed the rpm one more time after i did "rm -rf /etc/BackupPC" to make 
sure its a clean installation .

Now i have 2 Directories !

1) $ ls /var/lib/backuppc/
cpool  passwd  pc  pool  trash
2) $ ls /var/lib/BackupPC/
cpool  pc  pool  trash

now if i try to access it with http://localhost/backuppc it says the URL not 
found on the server!
BUT when 
i try to access with http://localhost/BackupPC . it asks for Credentials

seems i won`t be able to set a password for the user associated with this URL 
http://localhost/BackupPC ,obviously coz the   "passwd" file isn`t in 
/var/lib/BackupPC/passwd Directory

my config file shows the following . . .
---------------------------------------------- 
$ cat /etc/httpd/conf.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 
------------------------------------------------- 

HOW CAN I SOLVE THIS CHAOS ?????!!!!

i`m really Desperate to start BackupPC in Production Environment .. any help ?

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