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ZFS High Availability with Asynchronous Replication and zrep
(klarasystems.com)
Hosting your own services. Preferably at home and on low-power or shared hardware.
Also check out:
I've been hearing about ZFS and its beneficial features for years now, but mainstream Linux installers don't seem to support it, and I can't be bothered to switch filesystems after installing.
Out of curiosity - can anyone tell, what might be blocking them?
Edit: answering my own question: legal issues. Licenses "potentially aren't compatible".
Source: https://wiki.debian.org/ZFS
Apart from the license incompatibility (which doesn't stop it from being used by distros, as Ubuntu has shown): While it's a fantastic filesystem for servers, it is also resource hungry and not suitable for small or portable systems.
By default it consumes 30% of RAM as cache (ARC). And, we have btrfs now, which is a huge contender "CoW" filesystem for desktop.