After discovering BTRFS, I was amazed by its capabilities. So I started using it on all my systems and backups. That was almost a year ago.
Today I was researching small "UPS" with 18650 batteries and I saw posts about BTRFS being very dangerous in terms of power outages.
How much should I worry about this? I'm afraid that a power outage will cause me to lose two of my backups on my server. The third backup is disconnected from the power, but only has the most important part.
EDIT: I was thinking about it before I went to sleep. I have one of those Chinese emulation handhelds and its first firmware version used some FAT or ext. It was very easy to corrupt the file system if it wasn't shut down properly. They implemented btrfs to solve this and now I can shut it down any way I want, directly from the power supply and it never corrupts the system. That made me feel more at ease.