=== MySql ===

ssh command line: mysqldump -A –user=mysqlLogin –password=mysqlPass > mysql_2009_06_14.sql;
it makes dump all tables of your Date base.

ssh command line: tar -czf mysql_2009_06_14.tar.gz mysql_2009_06_14.sql;
it makes gzip archive of your dump

ssh command line: rm -f mysql_2009_06_14.sql;
This will delete the temporary file with dump

=== files ===
Go to directory with your web sites. (if you have Plesk then it will be var/www/)

ssh command line: tar -czf vps_2009_06_14.tar.gz vhosts
tar -czf [file name with your gzip backup] [directory with your web sites or * - all directory]