What's your monthly budget? Finding a cheap server with ~500 GB storage should not be that hard.
Does it have to be located in USA or Europe?
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Consider rsync.net It's a company called 'rsync' that sells backup space and obviously rsync software is supported
Axcessi's low cost Los Angeles carrier neutral colocation
One Wilshire and LA1 Equinix cross connect availability
High Density Supported • 208~240vac & 48vdc availability
Email: Carl(at)Axcessi(dot)com Skype: CarlRuszczynski