Why does Backblaze use over 250MB of memory on Windows?

Just fired-up Task Manger to kill a few Selenium Chromedriver processes that didn't close properly and came across "bztransmit64.exe" using over 290MB. A few seconds later it went down to 258MB.

I like the backup service but holy crap, that's a lot of memory. Why? What does it need to do? Is there a way to knock it down to something reasonable?