Place this in /etc/apt/preferences.d/90_zfs
:
Package: libnvpair1linux libuutil1linux libzfs2linux libzpool2linux spl-dkms zfs-dkms zfs-test zfsutils-linux zfsutils-linux-dev zfs-zed
Pin: release n=buster-backports
Pin-Priority: 990
$ apt update
$ apt install dpkg-dev linux-headers-$(uname -r) linux-image-arm64
$ apt install zfs-dkms zfsutils-linux
https://openzfs.github.io/openzfs-docs/Getting%20Started/Debian/index.html