A recent personal revelation: Backblaze, a system I just started using, doesn’t include .dmg files. If you thought the important documents in your secure disk images would be in your Backblaze backup during a data crisis, you’d be wrong.
It's disappointing since I just subscribed to Backblaze for a year. I already use Arq and S3 for backing up my encrypted disk images. I guess I'll keep doing that.