With C14 you create a "safe", you upload your data, and once done (or after 7 days), they archive your safe. To retrieve data, you need to ask for the safe to be unarchived and you get access back to your data, for 7 days.
I tried to use B2 recently but was being forced to enter a phone number. Waiting for a response from support, but so far that's blocking me from using B2. I don't know if C14 is better or not.
Yo! Sorry, yes. To sign in to the web for Backblaze B2 you can choose to have 2FV enabled - though we require that you at least set up the phone to do this. 2FV is like 2FA except in our implementation, at the moment, the only 2nd factor is a phone. 2FA tends to have a few more options (like apps and such) but it's essentially the same thing.
Here: "A file contains a sequence of bytes. Any file on your computer can be uploaded to B2 and stored in a Cloud Storage, as long as it's not too big. Files can range in size from 0 bytes to 5 billion bytes. "
Thanks. I was using rclone last time to upload files and that's when I had hit the file limit. So I googled and found the link I provided in my comment. It appears that rclone does not support large file upload! hm...