mysqldump -u root -h localhost -pMyPassword -A | gzip -9 > allmy-db.sql.gz

backup all database from srv to allmy-db.sql.gz file!

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To restore compressed backup files you can do the following:

gunzip < allmy-db.sql.gz | mysql -u root -pMyPassword

or uncompress gz file: gunzip allmy-db.sql.gz

and use:
mysql -u root -pMyPassword -h localhost -A < /path/allmy-db.sql
or
mysql -u root -pMyPassword -h localhost -e “source /path/allmy-db.sql” -A