1) Can I just load the data on a USB device? Or does it need an installation? Because I don't have a Graphiccard in my b.center...

You can download the DSS Lite and test just make sure to remove the other OS and set the USB as the first boot order in the BIOS.

2) During this process can something be damaged, or will it be possible to re-create the RAID level later on easy?

DSS Lite does not have RAID controller support. You could create the raid set and test or have each drive as a single drive and use the sw raid tool in DSS Lite - but you will need to test this.

3) Do you have access to the drivers which are used for the b.center? I got the hint, open-e has designed the previous installation.

Sorry to say we dont have support for this any more.