I just attempted an upgrade to Big Sur + ZFS 2.0.0-rc5. Unfortunately, it has revived the infamous 'The network backup disk does not support the required capabilities.' error message for me while attempting to use Time Machine with it.
My Time Machine setup is a ZFS dataset shared over the local network (therefore causing any client macOS machine to create a sparsebundle in it to store its backup data). I saw that the ZFS property com.apple.mimic_hfs had been moved to setting com.apple.mimic to 'hfs', so I set it accordingly and rebooted, to no effect. I'm posting a complete list of the dataset properties below for reference.
The filesystem path to the dataset is shared from macOS's Sharing preference pane, and the "advanced" setting 'Share as a Time Machine backup destination" flag is set on the share.
One possible peculiarity is that I have not yet completed a zpool upgrade under 2.0.0-rc5 (original was a fully upgraded pool under ZFS 1.9.4). I'm also posting an output of the pool's properties below for reference.
At the moment, I'm not sure if it's a problem with my setup, or a problem with the 2.0.0 release branch itself, so I shared this problem with you in case it might be the latter. I'll be happy to dig further if I can.
'zfs get all' output for the dataset:
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NAME PROPERTY VALUE SOURCE
tanker/backups/laptops/gbackup type filesystem -
tanker/backups/laptops/gbackup creation Wed Jan 15 17:20 2020 -
tanker/backups/laptops/gbackup used 3.66T -
tanker/backups/laptops/gbackup available 4.92T -
tanker/backups/laptops/gbackup referenced 3.66T -
tanker/backups/laptops/gbackup compressratio 1.02x -
tanker/backups/laptops/gbackup mounted no -
tanker/backups/laptops/gbackup quota none default
tanker/backups/laptops/gbackup reservation none default
tanker/backups/laptops/gbackup recordsize 128K default
tanker/backups/laptops/gbackup mountpoint /Volumes/tanker/backups/laptops/gbackup default
tanker/backups/laptops/gbackup sharenfs off default
tanker/backups/laptops/gbackup checksum on default
tanker/backups/laptops/gbackup compression on inherited from tanker
tanker/backups/laptops/gbackup atime on default
tanker/backups/laptops/gbackup devices on default
tanker/backups/laptops/gbackup exec on default
tanker/backups/laptops/gbackup setuid on default
tanker/backups/laptops/gbackup readonly off default
tanker/backups/laptops/gbackup zoned off default
tanker/backups/laptops/gbackup snapdir hidden default
tanker/backups/laptops/gbackup aclmode discard default
tanker/backups/laptops/gbackup aclinherit restricted default
tanker/backups/laptops/gbackup createtxg 1438 -
tanker/backups/laptops/gbackup canmount on default
tanker/backups/laptops/gbackup xattr on default
tanker/backups/laptops/gbackup copies 1 default
tanker/backups/laptops/gbackup version 5 -
tanker/backups/laptops/gbackup utf8only on -
tanker/backups/laptops/gbackup normalization formKC -
tanker/backups/laptops/gbackup casesensitivity sensitive -
tanker/backups/laptops/gbackup vscan off default
tanker/backups/laptops/gbackup nbmand off default
tanker/backups/laptops/gbackup sharesmb off default
tanker/backups/laptops/gbackup refquota none default
tanker/backups/laptops/gbackup refreservation none default
tanker/backups/laptops/gbackup guid 4248677606214551798 -
tanker/backups/laptops/gbackup primarycache all default
tanker/backups/laptops/gbackup secondarycache all default
tanker/backups/laptops/gbackup usedbysnapshots 0B -
tanker/backups/laptops/gbackup usedbydataset 3.66T -
tanker/backups/laptops/gbackup usedbychildren 0B -
tanker/backups/laptops/gbackup usedbyrefreservation 0B -
tanker/backups/laptops/gbackup logbias latency default
tanker/backups/laptops/gbackup objsetid 72 -
tanker/backups/laptops/gbackup dedup off default
tanker/backups/laptops/gbackup mlslabel none default
tanker/backups/laptops/gbackup sync standard default
tanker/backups/laptops/gbackup dnodesize legacy default
tanker/backups/laptops/gbackup refcompressratio 1.02x -
tanker/backups/laptops/gbackup written 3.66T -
tanker/backups/laptops/gbackup logicalused 3.74T -
tanker/backups/laptops/gbackup logicalreferenced 3.74T -
tanker/backups/laptops/gbackup volmode default default
tanker/backups/laptops/gbackup filesystem_limit none default
tanker/backups/laptops/gbackup snapshot_limit none default
tanker/backups/laptops/gbackup filesystem_count none default
tanker/backups/laptops/gbackup snapshot_count none default
tanker/backups/laptops/gbackup snapdev hidden default
tanker/backups/laptops/gbackup acltype nfsv4 default
tanker/backups/laptops/gbackup context none default
tanker/backups/laptops/gbackup fscontext none default
tanker/backups/laptops/gbackup defcontext none default
tanker/backups/laptops/gbackup rootcontext none default
tanker/backups/laptops/gbackup relatime off default
tanker/backups/laptops/gbackup redundant_metadata all default
tanker/backups/laptops/gbackup overlay on default
tanker/backups/laptops/gbackup encryption off default
tanker/backups/laptops/gbackup keylocation none default
tanker/backups/laptops/gbackup keyformat none default
tanker/backups/laptops/gbackup pbkdf2iters 0 default
tanker/backups/laptops/gbackup special_small_blocks 0 default
tanker/backups/laptops/gbackup com.apple.browse on default
tanker/backups/laptops/gbackup com.apple.ignoreowner off default
tanker/backups/laptops/gbackup com.apple.mimic hfs local
tanker/backups/laptops/gbackup com.apple.devdisk on local
'zpool get all' output for the pool:
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NAME PROPERTY VALUE SOURCE
tanker size 12.6T -
tanker capacity 57% -
tanker altroot - default
tanker health ONLINE -
tanker guid 14806831675958986757 -
tanker version - default
tanker bootfs - default
tanker delegation on default
tanker autoreplace off default
tanker cachefile - default
tanker failmode wait default
tanker listsnapshots off default
tanker autoexpand on local
tanker dedupratio 1.00x -
tanker free 5.31T -
tanker allocated 7.31T -
tanker readonly off -
tanker ashift 12 local
tanker comment - default
tanker expandsize - -
tanker freeing 0 -
tanker fragmentation 4% -
tanker leaked 0 -
tanker multihost off default
tanker checkpoint - -
tanker load_guid 6364253781748769919 -
tanker autotrim off default
tanker compatibility off default
tanker feature@async_destroy enabled local
tanker feature@empty_bpobj active local
tanker feature@lz4_compress active local
tanker feature@multi_vdev_crash_dump enabled local
tanker feature@spacemap_histogram active local
tanker feature@enabled_txg active local
tanker feature@hole_birth active local
tanker feature@extensible_dataset active local
tanker feature@embedded_data active local
tanker feature@bookmarks enabled local
tanker feature@filesystem_limits enabled local
tanker feature@large_blocks enabled local
tanker feature@large_dnode enabled local
tanker feature@sha512 enabled local
tanker feature@skein enabled local
tanker feature@edonr enabled local
tanker feature@userobj_accounting disabled local
tanker feature@encryption active local
tanker feature@project_quota disabled local
tanker feature@device_removal enabled local
tanker feature@obsolete_counts enabled local
tanker feature@zpool_checkpoint enabled local
tanker feature@spacemap_v2 active local
tanker feature@allocation_classes enabled local
tanker feature@resilver_defer enabled local
tanker feature@bookmark_v2 enabled local
tanker feature@redaction_bookmarks disabled local
tanker feature@redacted_datasets disabled local
tanker feature@bookmark_written disabled local
tanker feature@log_spacemap disabled local
tanker feature@livelist disabled local
tanker feature@device_rebuild disabled local
tanker feature@zstd_compress disabled local
tanker feature@draid disabled local