I think there may be something missing in the comparison table.
When I look at the prices of Backblaze, https://www.backblaze.com/b2/cloud-storage-providers.html it is $0.05 for 1 mo but in the table on the website of C14, it's written "free"
Also I think Backblaze is geared towards backing up your Desktop with its own client software, or can I use regular scp/ftp/etc(standard transfer utilties) to do my own upload/download?
Backblaze "B2" is a separate service for blob storage with a REST API. It's currently in public beta. I presume its built on the same infrastructure. You can store about 10GB for free if you want to play around with it. (backblaze.com/b2/docs)