I need to export everything through command line

hi,

If you have configured your WHM backup previously , you can get the backup by manually running the script " /usr/local/cpanel/scripts/cpbackup " in the shell .

In the above is not done you can make a list of your domains and put in in a for loop for account backup.

for x in `ls /var/cpanel/users` ; do /scripts/pkgacct $x ; done