Our team is JuiceFS's launching customer. We've been using its enterprise offering since late 2016 and accumulated several hundreds TBs of data on JuiceFS along the way, it worked well.

I've wrote a blog post (in Chinese) explaining our MySQL backup practice around JuiceFS in 2018. https://tech.xiachufang.xyz/2018-04-17/mysql-backup-practice

They provided an open source version recently.

I'm from JuiceFS team. We run JuiceFS full managed service on every public cloud worldwide for 4 years. We decide open source it for more explore and usage.