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+====== Example for using rsnapshot-zfs-helper with rsnapshot ======
+This example has been created using Debian 9.3 .
+<code>
+##
+## setup zfs (optional)
+##
+# 'bpo' kernel won't do the trick
+apt-get install linux-image-amd64
+apt-get clean
+reboot
+- add "contrib" to the apt-sources
+apt-get update
+apt-get install zfs-dkms zfsutils-linux rsnapshot
+apt-get clean
+/sbin/modprobe zfs
+## create partition for zfs:
+Device     Boot   Start       End   Sectors  Size Id Type
+...
+/dev/sda3       4194304 209715199 205520896   98G bf Solaris
+## create zpool without mount point
+zpool create zp-bak /dev/sda3 -m none
+# create prereq. data sets
+zfs create zp-bak/backup                        -o compression=lz4 -o snapdir=hidden -o xattr=sa -o acltype=posixacl -o mountpoint=/backup
+zfs create zp-bak/backup/hosts                  -o compression=lz4 -o snapdir=hidden -o xattr=sa -o acltype=posixacl -o mountpoint=/backup/hosts
+df
+->
+   Filesystem     1K-blocks    Used Available Use% Mounted on
+   ...
+   zp-bak/backup        99041152     128  99041024   1% /backup
+   zp-bak/backup/hosts  99041152     128  99041024   1% /backup/hosts
+##
+## create ssh keypair
+##
+ssh-keygen -N '' -C "backup@$(hostname)-$(date -Is)" -f /root/.ssh/id_rsa
+##
+## install & prepare rsnapshot
+##
+apt-get install rsnapshot
+apt-get clean
+cp -ax /etc/rsnapshot.conf /etc/rsnapshot.conf.$( date -Is )
+vi /etc/rsnapshot.conf
+    [...]
+    snapshot_root   /backup/hosts/vstest01
+    cmd_ssh         /usr/bin/ssh
+    #interval   hourly  6
+    interval    daily   7
+    interval    weekly  4
+    interval    monthly 3
+    cmd_cp          /bin/true
+    cmd_preexec     /usr/sbin/rsnapshot-zfs-helper /etc/rsnapshot.conf preexec
+    cmd_postexec    /usr/sbin/rsnapshot-zfs-helper /etc/rsnapshot.conf postexec
+vi /etc/rsnapshot-zfs-helper.conf
+    snapshots_config_dir=/etc
+##
+## create a backup job
+##
+# create zfs dataset
+zfs create zp-bak/backup/hosts/vstest01 -o compression=lz4 -o snapdir=visible -o xattr=sa -o acltype=posixacl -o mountpoint=/backup/hosts/vstest01/daily.0
+df
+->
+   Filesystem     1K-blocks    Used Available Use% Mounted on
+   ...
+   zp-bak/backup/hosts/vstest01  99041024       0  99041024   0% /backup/hosts/vstest01/daily.0
+# create backup config
+/etc/rsnapshot.conf
+    backup  root@vstest01:/ ./
+# distribute ssh key to backup client
+ssh-copy-id root@vstest01
+# test ssh login
+ssh root@vstest01 hostname
+# run first backup
+rsnapshot daily
+# check
+zfs list -t all
+->
+    NAME                                                      USED  AVAIL  REFER  MOUNTPOINT
+    zp-bak                                                    592M  93.9G    19K  none
+    zp-bak/backup                                             592M  93.9G    19K  /backup
+    zp-bak/backup/hosts                                       592M  93.9G    40K  /backup/hosts
+    zp-bak/backup/hosts/vstest01                              592M  93.9G   592M  /backup/hosts/vstest01/daily.0
+    zp-bak/backup/hosts/vstest01@daily.2018-01-30T14:53:29Z      0      -   592M  -
+# run second backup
+rsnapshot daily
+# check
+zfs list -t all
+->
+    NAME                                                      USED  AVAIL  REFER  MOUNTPOINT
+    zp-bak                                                    597M  93.9G    19K  none
+    zp-bak/backup                                             596M  93.9G    19K  /backup
+    zp-bak/backup/hosts                                       596M  93.9G    40K  /backup/hosts
+    zp-bak/backup/hosts/vstest01                              596M  93.9G   592M  /backup/hosts/vstest01/daily.0
+    zp-bak/backup/hosts/vstest01@daily.2018-01-30T14:53:29Z  4.32M      -   592M  -
+    zp-bak/backup/hosts/vstest01@daily.2018-01-30T14:57:49Z      0      -   592M  -
+##
+## enable rotation of higher rotation levels
+##
+/etc/cron.d/rsnapshot-zfs-helper
+23  * * *  root /usr/sbin/rsnapshot-zfs-helper /etc/rsnapshot.conf rotate daily
+23  * * 5  root /usr/sbin/rsnapshot-zfs-helper /etc/rsnapshot.conf rotate weekly
+23  1 * *  root /usr/sbin/rsnapshot-zfs-helper /etc/rsnapshot.conf rotate monthly
+</code>