How to take back-up and restore the postgresql database?? using maven

[Charles A]

        Hi All,

          I'm using Hibernate and Postgresql DB in our project. Now my maven 
script creating .War file. 
        But problem is i have to take back-up and delete my database before run 
the maven script and restore the back-up database, once new database has 
created.   
        I have checked DBUNIT and ddlutils site, but i didn't get clear idea 
where to start? and  how to proceed?

        Thanks in advance

        Thanks & Regards
        Charles