Sql SERVER database update

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SQL

server

I want to kept data of SQL SERVER as a backup from live db to local system. i take script every month and create new db & enter all data in new db through script.
I want to kept data in one db not in multiple (that i create every month). How is this possible that i could not create new db every month and all data update in existing db

What I have tried:

is it possible that database data update in same db every time for example i take script of month January and make a db with name "testing" & when i take script of February and how i enter data in the same db "testing" that previous data present and new data also entered