Many people think that it is enough to ensure that the storage medium is redundant - and you are fine. WRONG!!!!!
Cephfs is great. It can be used to store and share files and can take advantage of the granularity and performance of Ceph. Big amounts of data can be stored and live snapshots can be taken so remote backups can be easily performed.
One of the interesting features of BTRFS is the dynamic snapshot generation, which grantees the possibility to have a perfect and immediate copy of a specific path.
Sometimes containers log a lot of things, and the logfile can become huge. This happens because containers aren't supposed to run for a long time but to be created/disposed regularly. Here's how
I've been using BTRFS for years and I've had few problems. Some of them are small and can be avoided with some smart improvements.