Monthly backup of SQL server DB to PostgreSQL?

The company I'm working for has a SQL Server with read-only access. They use Crystal Reports hooked up to PostgreSQL for reporting. Is there any way to make it so I can move all the data from the MSSQL DB to PostgreSQL **without** user interaction? That seems to be the caveat to what I'm trying to do. They need to be able to run this report after I leave without having to interact with it during the process. Or am I looking at this the wrong way? Is there a way to save a "snapshot" of the SQL Server DB that can be manipulated in Crystal Reports? The ultimate goal is that since the DB is dynamic we need to be able to have a static DB at the end of the month that all the reports can be ran on without having to worry about it changing.