I'm sorry but looks like I've no chance to make backup ...
I created a backup directory, cmoded to 777, in the global option set the backup dir to /hsphere/local/home/assilny/aerysoul.com/backup , the Path to mysqldump is usr/bin/mysqldump ... at least I got this error :
Command being used to execute dumps (specific tables are executed individually):
usr/bin/mysqldump --opt -h 22.214.171.124 -*** -***
Warning: access.sql is 0 bytes or did not get created.
You should double-check your .sql files to be sure the backup completed successfully.
Make a backup is too important.
Thanks fot help !