Yev from Backblaze here -> You're not wrong. In fact we recommend having an on-site backup FIRST, then moving on to other backup mediums. I wrote a post about it -> https://www.backblaze.com/blog/the-3-2-1-backup-strategy/. Online backup is great, but local backup will always be quicker to get data on to and off of!
They delete stuff you have not backed up in the last 30 days. If you have a removable drive that you backed up to backblaze, it must go through their program again once every 30 days, or they will consider this abandoned.
Ask yourself this, now: Why cloud, when $70 buys you a 1TB portable hard drive with ~100MB/sec bandwidth (that you don't have at all unless you live in Japan or Korea, and that you don't get to Dropbox/BackBlaze even if you live there).