zfs-hold — hold ZFS snapshots to prevent their removal

zfshold [-r] tagsnapshot…
         Adds  a  single  reference, named with the tag argument, to the specified snapshots.  Each snapshot has
         its own tag namespace, and tags must be unique within that space.

         If a hold exists on a snapshot, attempts to destroy that snapshot by  using  the  zfsdestroy  command
         return EBUSY.

         -r  Specifies  that a hold with the given tag is applied recursively to the snapshots of all descendent
             file systems.

       zfsholds [-rHp] snapshot…
         Lists all existing user references for the given snapshot or snapshots.

         -r  Lists the holds that are set on the named descendent snapshots, in addition to listing the holds on
             the named snapshot.

         -H  Do not print headers, use tab-delimited output.

         -p  Prints holds timestamps as Unix epoch timestamps.

       zfsrelease [-r] tagsnapshot…
         Removes a single reference, named with the tag argument, from the specified snapshot or snapshots.  The
         tag must already exist for each snapshot.  If a hold exists on a snapshot,  attempts  to  destroy  that
         snapshot by using the zfsdestroy command return EBUSY.

         -r  Recursively releases a hold with the given tag on the snapshots of all descendent file systems.

       zfs-hold — hold ZFS snapshots to prevent their removal

zfs-destroy(8)

OpenZFS                                           June 30, 2019                                      ZFS-HOLD(8)

zfshold [-r] tagsnapshot…
       zfsholds [-rHp] snapshot…
       zfsrelease [-r] tagsnapshot…