I am really happy to see I'm not the only one doing this.

I was shocked how fast B2 took my data. The initial 160GB upload took hours with my FIOS connection. They've been amazing.
What I love about Arq is, I have it also backing up to my Google Drive account (encrypted), 2 external drives (one at work, one at home), --- backing up the entire Home folder on my Mac. Set it to not backup while on battery - it does its thing automatically when I plug in to power.
I have had to download 15GB of data from B2 - at $.01/GB down - took minutes and was super easy and super cheap. Just make sure to write down those encryption keys into 1Password or something.
Love their hard drive stats reports!
https://www.backblaze.com/blog/hard-drive-stats-for-q1-2018/