To backup  the original files in your online albums, you can download them individually as compressed archives in ZIP format, which you can then unpack on your PC for further use (e.g. upload to another service).
To do this, open Online Media Manager by clicking on "Manage content" or "Start Online Media Manager" in MAGIX Online World's Control Center. 

Note: Online Media Manager is the interface you use to create your albums and upload content.

• On the Online Media Manager home page, you will see an overview of all albums displayed in tile view. Simply
  click
  on an album to select it.
  
• To save the selected album, click the "Download" button at the top of the interface. The download will start. Please wait until the download is complete.
• Open your download folder and browse for the downloaded file (e.g. by sorting the file list by modification date.)
• The file name consists of a string of digits and capital letters (e.g. 1BF3BB2CE0E9425FDFDBFB72C7C4B7AF.zip).
• To extract the archive, right-click the file in Windows Explorer and select "Extract All".

Tip: To better identify your content, rename files by right-clicking them in Windows Explorer and selecting "Rename".

If you want to backup more albums, go back to  Online Media Manager and select the next album by clicking on it and repeating steps 1 to 5.