MySQL data to Postgres every X time Our team (Uni students) have a project that we are updating.

Old project team has a Live MySQL database. We want to make a archive/warehouse from it in PostgreSQL. 

My question is: How can we import / copy data from MySQL DB to PostgreSQL DB after every X time (12 hours for instance) has passed?
You'll need to either use an ETL Tool eg Microsoft SSIS. There's plenty of open source products available too. Or you can build your own extract utility using a programming language like PHP, .Net etc. 

The Kimball guys have an article on whether you should build your own or use an off the shelf product.
http://www.kimballgroup.com/2008/04/should-you-use-an-etl-tool/

To schedule the load, you can use windows scheduler on Windows or cron jobs on Unix.