https://bcachefs.org/

The COW filesystem for Linux that won't eat your data".

Bcachefs is an advanced new filesystem for Linux, with an emphasis on reliability and robustness and the complete set of features one would expect from a modern filesystem.

Copy on write (COW) - like zfs or btrfs
Full data and metadata checksumming
Multiple devices
Replication
Erasure coding (not stable)
Caching, data placement
Compression
Encryption
Snapshots
Nocow mode
Reflink
Extended attributes, ACLs, quotas
Scalable - has been tested to 100+ TB, expected to scale far higher (testers wanted!)
High performance, low tail latency