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backup the difference with sql server express between 2 timestamps

I am newbie to sql and have sql server express edition installed on my PC and contains a database 'Jdatabase' on 1sept and took a backup(by right clicking on database -> tasks->backup using 'sql server management studio') of it and backup is 20GB after 1 month , I took the backup for the same database and it increased to 35GB. Likewise saving the backup is going to be huge after certain time and is a problem for me.

If I want to backup only the difference ie., 15GB that has grown in 1 month time. what is the best way to do it using SQL server express.