Trust is very important for us. Can we trust to Dropbox or others, if your data is not encrypted, before uploaded? I think no. This is why, we open source our client on GitHub, so as you can see, no any updates, except README file.
https://github.com/savefileme/savefileme/blob/master/api/acc... The function UploadFile use aesgcm.NewEncryptReader for data encryption.
This is fully anonymous service and free for use without any registration, so no any payment options on the site, we do not collect your personal information at all. Payment option is available when you simply try to upload your first file. Than, our payment provider collects your personal information and sends you invoice, with all legal information, and physical address too.
As for account creation process, we wanted to make it as simple as possible. You can extract you credentials with command savefileme account export for backup. The client reminds you about that.
And little bit about guarantees... No service gives 100% guarantee. Therefore, it is necessary to periodically test your backups, regardless of whether you are using BackBlaze or No Name.