jungledisk is owned by rackspace and offers an option to choose Amazon S3 which charges for traffic whereby if data is stored on rackspace, no charges for traffic. For a small company, to just backup files with jungle disk from ubuntu linux OS computers, i wonder what to choose. Commercial psychologically the price on traffic and the Amazon brand make it appear or maybe it is, of better quality than the cheaper Rackspace offer which is when it comes for just backing up ok ? but if its about backing up around 30 GB which updates from time to time, what would you consider a good choice ?
SnapOverflow
Personally, I would recommend that you go with Rackspace Cloud Files. The Cloud Files implementation, I've found, is a bit faster than S3. S3 has some stability and scaling issues that cause the service to error or slow down at times.
You should also take in to consideration the latency from your location to the servers, as this will affect your speed. Rackspace Cloud Files is located in Dallas, Texas. S3 is located in Northern Virginia. I generally say if you're west of the rockies, S3 should not be considered, as the latency is pretty high. Outside the US, S3 UK may be a better option.
Hope that helps... Sorry if that sounded sales-ey or biased! JD support here.