Backup everything except one record
Its too simple if you have gone through the mysqldump manual

First run a mysql dump ignore the table you would like to skip

mysqldump -p -u root db_name --ignore-table=db_name.tbl_name &gt; sql.sql


Then once more for your table

mysqldump -p -u root db_name tbl_name --where "id!=2" &gt;&gt; sql.sql


As a note, if you are giving something in --where, it applicable for all the tables your are using. It will be useful in case of multi-tenant db.