With all the BTRFS bashing going on, even though it is recommended one cares about checksummed data and metadata, there wasn't an easy alternative. That has now been solved.
ZFS is now (ie, for some time now) available as a set of native (contrib) packages in Debian. I will need to give that a test now. [zfs-zed, zfsutils-linux, zfs-dkms, zfs-initramfs, zfsutils, zfs-dracut]. With the right set of packages and boot configuration, it is also possible to use zfs as a boot partition.
Package is tracker is zfs-linux.
Primary web site is zfsonlinux.org. Documentation, FAQ, and a wiki can be found there.
A quicky setup and go can be found at HowtoForge.