Who’s using an experimental filesystem and risking critical data loss? Rule one of experimental file systems is have a copy on a not experimental file system.
The biggest dirty secret of the IT world is that everyone knows you should have more backups than God, but everyone runs with an average of about zero.
Sure, and when I go, 'I'm just going to slap this together and if it dies I'll rebuild it' I run on ext4 instead of an experimental service. If there is a reason that I need to run something 'experimental' you gonna bet your ass that I'm going to back things up.