As you can bet, only BackBlaze can answer what their software is supposed to do.
As to the power issue, why not put a new battery in the laptop (prices have dropped) or keep it on mains power?
It was litterly like 15 video files away from being done backing up (uploading) Everything to the cloud,, and then my stupid laptop turned off! (my laptop has a issue,, it turns off without warning if its at low power, it also runs out of power within minutes) Then when i turned it back on, IT practically started the whole darned upload over again!, Its not supposed to do that! I even checked, a file that i happened to see in the "Now uploading part 14 of IMG_0112" section that it uploaded a specific file, then i went to check the cloud after the power failure and it wasn't there!, It deleted it or something so that i can waste more time! Not really looking for a solution as much as a explanation, because i am kind of annoyed right now!