Report Model download and backup, also best practice

I will be deploying Models and Data Sources (potentially) to multiple servers. After my last mishap is there a way to get the latest Model downloaded from the SSRS site (SSRS native mode) so that I can start with what is there. (If you think of SSAS you can import it into a BIDS project)Whats best practice for this. I am currently looking at one server and the copy in source control looks different to the version on the server file system, that intern has different dates to what is up in SSRS. Does not make me feel confident.When deploying is there an easy way to avoid mistakes?ThanksE