RAW files are not in the presentation formats, so in order to view them, RAW files need to be converted into a JPEG format. Uploading RAW files for archiving purposes is a nice idea, but there are not many photo-sharing services that support RAW formats.
In order to backup and upload RAW files you should search for another option that support RAW Files. Cloud storage are a good option to backup RAW files. Flickr as a photo-sharing website is brilliant, but if we talk about backing up or uploading RAW files, then it does not suffice our purpose.
Even if you try to upload a RAW file to Flickr, they will be converted into JPEG formats, so that they are viewable to others. So, if you're thinking to upload RAW files along with all the information required to convert them to JPEG pictures, why not convert them NOW on your desktop and then upload the JPEGs to Flickr? Flickr has also clearly mentioned in the FAQ section.
Have a look:
"Flickr officially supports JPEGs, non-animated GIFs, and PNGs. You can also upload TIFFs and some other file types, but they will automatically be converted to and stored in JPEG format." It clearly means that the browsers can't display RAW files, So, when you upload a RAW file, Flickr automatically converts them to JPG / JPEG without storing your original RAW files. Flickr only store copies in JPEG format. What we recommend is; do not rely on Flickr to convert your RAW files to JPEG, instead do it yourself so that you can assure that they look best. Relying on Flickr for conversion is like compromising on quality. Once all the editing and conversion is done, then you can upload the final picture to your 1TB Flickr account.