diff --git a/core/base.module.sh b/core/base.module.sh
index a220aaa..b2cca24 100755
--- a/core/base.module.sh
+++ b/core/base.module.sh
@@ -107,6 +107,8 @@ function prepare.setCIS() {
     CIS[DOMAINDEFINITIONS]="${CIS[ROOT]}definitions/${CIS[DOMAIN]}/"
     CIS[DOMAINSTATES]="${CIS[ROOT]}states/${CIS[DOMAIN]}/"
 
+    CIS[COMPOSITIONS]="${CIS[DOMAINDEFINITIONS]:?"Missing DOMAINDEFINITIONS"}compositions/"
+
     CIS[SET]="normal"
     # Sets the write protection of array 'CIS'
     declare -A -g -r CIS
diff --git a/script/host/zfs/composition-sync/setupCompositionReceivingHost.sh b/script/host/zfs/composition-sync/setupCompositionReceivingHost.sh
deleted file mode 100755
index f2d0f4d..0000000
--- a/script/host/zfs/composition-sync/setupCompositionReceivingHost.sh
+++ /dev/null
@@ -1,35 +0,0 @@
-#!/bin/bash
-
-[ "$(id -u)" != "0" ] \
-    && sudo "${0}" \
-    && exit 0
-
-
-
-_SETUP="$(readlink -f "${0}" 2> /dev/null)"
-
-# Folders always ends with an tailing '/'
-_CIS_ROOT="${_SETUP%%/script/host/zfs/composition-sync/*}/"             #Removes longest  matching pattern '/script/host/zfs/composition-sync/*' from the end
-_DOMAIN="$("${_CIS_ROOT:?"Missing CIS_ROOT"}core/printOwnDomain.sh")"
-_DEFINITIONS="${_CIS_ROOT:?"Missing CIS_ROOT"}definitions/${_DOMAIN:?"Missing DOMAIN"}/"
-
-
-
-function checkPreconditions() {
-    [ -d "${_DEFINITIONS:?"Missing DEFINITIONS"}compositions" ] \
-        && return 0
-
-    echo "No folder for your defined composition settings found: ${_DEFINITIONS:?"Missing DEFINITIONS"}compositions"
-    echo "Please create it and add your custom composition settings in there, following this convention:"
-    echo "  1.) './NAME_OF_THE_COMPOSITION/current-host'            containing one line with the FQDN of the host running the composition."
-    echo "  2.) './NAME_OF_THE_COMPOSITION/composition-sync-hosts'  containing a list of hosts receiving the composition, one host with its FQDN per line."
-    return 1
-}
-
-
-
-echo "Setup the host that receives the composition of others ... " \
-    && checkPreconditions \
-    && exit 0
-
-exit 1
diff --git a/script/host/zfs/composition-sync/setupCompositionRunningHost.sh b/script/host/zfs/composition-sync/setupCompositionRunningHost.sh
index 09ea551..1f17a8b 100755
--- a/script/host/zfs/composition-sync/setupCompositionRunningHost.sh
+++ b/script/host/zfs/composition-sync/setupCompositionRunningHost.sh
@@ -4,24 +4,16 @@
     && sudo "${0}" \
     && exit 0
 
-
-
-_SETUP="$(readlink -f "${0}" 2> /dev/null)"
-
-# Folders always ends with an tailing '/'
-_CIS_ROOT="${_SETUP%%/script/host/zfs/composition-sync/*}/"             #Removes longest  matching pattern '/script/host/zfs/composition-sync/*' from the end
-_CORE_SCRIPTS="${_CIS_ROOT:?"Missing CIS_ROOT"}core/"
-_DOMAIN="$("${_CIS_ROOT:?"Missing CIS_ROOT"}core/printOwnDomain.sh")"
-_DEFINITIONS="${_CIS_ROOT:?"Missing CIS_ROOT"}definitions/${_DOMAIN:?"Missing DOMAIN"}/"
+source /cis/core/base.module.sh
 
 
 
 echo "Setup the user and permission to enable syncing compositions of this host ... " \
-    && "${_CORE_SCRIPTS:?"Missing CORE_SCRIPTS"}addNormalUser.sh" composition-sync \
+    && "${CIS[COREROOT]:?"Missing CORE_SCRIPTS"}addNormalUser.sh" composition-sync \
     && echo \
-    && "${_CORE_SCRIPTS:?"Missing CORE_SCRIPTS"}defineAuthorizedKeysOfUser.sh" "${_DEFINITIONS}" composition-sync \
+    && "${CIS[COREROOT]:?"Missing CORE_SCRIPTS"}defineAuthorizedKeysOfUser.sh" "${CIS[DOMAINDEFINITIONS]}" composition-sync \
     && echo \
-    && "${_CORE_SCRIPTS:?"Missing CORE_SCRIPTS"}ensureUsageOfDefinitions.sh" "${_DEFINITIONS}" /etc/sudoers.d/allow-composition-sync-send \
+    && "${CIS[COREROOT]:?"Missing CORE_SCRIPTS"}ensureUsageOfDefinitions.sh" "${CIS[DOMAINDEFINITIONS]}" /etc/sudoers.d/allow-composition-sync-send \
     && exit 0
 
 exit 1
diff --git a/script/host/zfs/composition-sync/setupSyncHost.sh b/script/host/zfs/composition-sync/setupSyncHost.sh
new file mode 100755
index 0000000..1dd8745
--- /dev/null
+++ b/script/host/zfs/composition-sync/setupSyncHost.sh
@@ -0,0 +1,56 @@
+#!/bin/bash
+
+[ "$(id -u)" != "0" ] \
+    && sudo "${0}" \
+    && exit 0
+
+source /cis/core/base.module.sh
+
+
+
+function setup() {
+    local _COMPOSITION _COMPOSITIONS_FOLDER _CURRENT_HOST_FILE _SYNC_HOSTS_FILE
+    _COMPOSITION="${1}"
+    _COMPOSITIONS_FOLDER="${CIS[DOMAINDEFINITIONS]}compositions/"
+    _CURRENT_HOST_FILE="${_COMPOSITIONS_FOLDER}${_COMPOSITION}/current-host"
+    _SYNC_HOSTS_FILE="${_COMPOSITIONS_FOLDER}${_COMPOSITION}/composition-sync-hosts"
+    readonly _COMPOSITION _COMPOSITIONS_FOLDER
+
+    echo "Setup the host that receives the composition of others ..."
+    echo
+    echo "No folder for your defined composition settings found: ${_COMPOSITIONS_FOLDER}"
+    echo "Please create it and add your custom composition settings in there, following this convention:"
+    echo "  1.) './NAME_OF_THE_COMPOSITION/current-host'            containing one line with the FQDN of the host running the composition."
+    echo "  2.) './NAME_OF_THE_COMPOSITION/composition-sync-hosts'  containing a list of hosts receiving the composition, one host with its FQDN per line."
+    echo
+
+    [ -d "${_COMPOSITIONS_FOLDER}" ] \
+        && echo "Definiton folder for compositions found: ${_COMPOSITIONS_FOLDER}" \
+        && echo
+
+    [ -n "${_COMPOSITION}" ] \
+        && [ -f "${_CURRENT_HOST_FILE}" ] \
+        && echo "Current defined host to run composition '${_COMPOSITION}' is:" \
+        && cat "${_CURRENT_HOST_FILE}" \
+        && echo
+
+    [ -n "${_COMPOSITION}" ] \
+        && [ -f "${_SYNC_HOSTS_FILE}" ] \
+        && echo "Following hosts should sync the ZFS of this composition '${COMPOSITION}':" \
+        && cat "${_SYNC_HOSTS_FILE}" \
+        && echo
+
+    echo "Optionally you can create following file:"
+    echo "  - rollback   (e.g.: date +%F > rollback)                 : allows the removal of the newest @SYNC snapshots of this day,"
+    echo "                                                                 as long as no normal snapshot is reached."
+    echo "  - ssh-port   (e.g.: echo 22 > ssh-port)                  : allows to use a custom port for the SSH connection."
+    echo '  - zfs-branch (e.g.: echo zpool1/persistent > zfs-branch) : allows to use a custom zfs prefix like: ${zfs-branch}/${composition}.'
+    return 0
+}
+
+
+
+base.set COMPOSITION "${1}" '^([a-zA-Z0-9][a-zA-Z0-9_-]*)?$' || exit 1
+setup "${COMPOSITION}"
+
+
diff --git a/script/host/zfs/snapshot.sh b/script/host/zfs/snapshot.sh
new file mode 100755
index 0000000..d889904
--- /dev/null
+++ b/script/host/zfs/snapshot.sh
@@ -0,0 +1,145 @@
+#!/bin/bash
+
+source /cis/core/base.module.sh
+
+
+
+function cleanup() {
+    local _MIN_MIN _HOUR_MIN _DAY_MIN _MONTH_MIN
+    _MINUTELY_MIN=5
+    _HOURLY_MIN=24
+    _DAILY_MIN=7
+    _MONTHLY_MIN=36
+    readonly _MIN_MIN _HOUR_MIN _DAY_MIN _MONTH_MIN
+
+    local _COMPOSITION _CURRENT_HOST _ZFS_BRANCH _ZFS
+    ls -d "${CIS[COMPOSITIONS]:?"Missing CIS_COMPOSITIONS"}"*/ | while read -r _COMPOSITION
+    do
+        _COMPOSITION="${_COMPOSITION%/}"      #Remove tailing '/' if exists
+        _COMPOSITION="${_COMPOSITION##*/}"    #Remove leading parts
+        _CURRENT_HOST="$(cat "${CIS[COMPOSITIONS]}${_COMPOSITION}/current-host" 2> /dev/null)"
+        _ZFS_BRANCH="$(cat "${CIS[COMPOSITIONS]}${_COMPOSITION}/zfs-branch" 2> /dev/null)"
+        _ZFS_BRANCH="${_ZFS_BRANCH%/}"        #Remove tailing '/' if exists
+
+        if [ "${_CURRENT_HOST}" == "${CIS[HOST]:?"Missing CIS_HOST"}" ]; then
+            _ZFS="$(zfs list -H -o name "${_ZFS_BRANCH:-"zpool1/persistent"}/${_COMPOSITION}" 2> /dev/null)"
+        else
+            _ZFS="$(zfs list -H -o name "${_ZFS_BRANCH:-"zpool1/persistent"}/${_COMPOSITION}-BACKUP" 2> /dev/null)"
+        fi
+
+        [ -n "${_ZFS}" ] \
+            && printf %b "Cleaning snapshots of: '${_ZFS}'\n" \
+            && local _LIST=( $(zfs list -t snap -H -o name -S creation "${_ZFS}" | grep -F '@SNAP' ) )
+
+        # Nothing to do
+        [ ${#_LIST[@]} -eq 0 ] && continue
+
+        _COUNT_MINUTELY=0
+        _COUNT_HOURLY=0
+        _COUNT_DAILY=0
+        _COUNT_MONTHLY=0
+
+        for _SNAPSHOT in "${_LIST[@]}"; do
+            case "${_SNAPSHOT}" in
+                *"@SNAPMINUTELY_"*) 
+                    ((_COUNT_MINUTELY++))
+                    if [ ${_COUNT_MINUTELY} -gt ${_MINUTELY_MIN} ]; then
+                        printf %s "  - remove snapshot (${_COUNT_MINUTELY}): '@${_SNAPSHOT#*@}' ... " >&2
+                        zfs destroy "${_SNAPSHOT}" \
+                            && printf %b '(done)\n' \
+                            || printf %b '(FAIL)\n'
+                    fi
+                    ;;
+                *"@SNAPHOURLY_"*) 
+                    ((_COUNT_HOURLY++))
+                    if [ ${_COUNT_HOURLY} -gt ${_HOURLY_MIN} ]; then
+                        printf %s "  - remove snapshot (${_COUNT_HOURLY}): '@${_SNAPSHOT#*@}' ... " >&2
+                        zfs destroy "${_SNAPSHOT}" \
+                            && printf %b '(done)\n' \
+                            || printf %b '(FAIL)\n'
+                    fi
+                    ;;
+                *"@SNAPDAILY_"*) 
+                    ((_COUNT_DAILY++))
+                    if [ ${_COUNT_DAILY} -gt ${_DAILY_MIN} ]; then
+                        printf %s "  - remove snapshot (${_COUNT_DAILY}): '@${_SNAPSHOT#*@}' ... " >&2
+                        zfs destroy "${_SNAPSHOT}" \
+                            && printf %b '(done)\n' \
+                            || printf %b '(FAIL)\n'
+                    fi
+                    ;;
+                *"@SNAPMONTHLY_"*) 
+                    ((_COUNT_MONTHLY++))
+                    if [ ${_COUNT_MONTHLY} -gt ${_MONTHLY_MIN} ]; then
+                        printf %s "  - remove snapshot (${_COUNT_MONTHLY}): '@${_SNAPSHOT#*@}' ... " >&2
+                        zfs destroy "${_SNAPSHOT}" \
+                            && printf %b '(done)\n' \
+                            || printf %b '(FAIL)\n'
+                    fi
+                    ;;
+            esac
+        done
+    done
+}
+
+function snapshot() {
+    local _MINUTE _HOUR _DAY _MONTH
+    _MINUTE="$(date -u "+%Y-%m-%d_%H:%M")Z"
+    _HOUR="${_MINUTE:0:13}Z"
+    _DAY="${_MINUTE:0:10}Z"
+    _MONTH="${_MINUTE:0:7}Z"
+    readonly _MINUTE _HOUR _DAY _MONTH
+
+    [ ! -d /tmp/locks ] && mkdir /tmp/locks
+
+    local _COMPOSITION _CURRENT_HOST _MODE _ZFS_BRANCH _ZFS
+    ls -d "${CIS[COMPOSITIONS]:?"Missing CIS_COMPOSITIONS"}"*/ | while read -r _COMPOSITION
+    do
+        _COMPOSITION="${_COMPOSITION%/}"      #Remove tailing '/' if exists
+        _COMPOSITION="${_COMPOSITION##*/}"    #Remove leading parts
+        _CURRENT_HOST="$(cat "${CIS[COMPOSITIONS]}${_COMPOSITION}/current-host" 2> /dev/null)"
+        _MODE="${1:-"$(cat "${CIS[COMPOSITIONS]}${_COMPOSITION}/snapshot-mode" 2> /dev/null)"}"
+        _MODE="${_MODE:-"HOURLY"}"
+        _ZFS_BRANCH="$(cat "${CIS[COMPOSITIONS]}${_COMPOSITION}/zfs-branch" 2> /dev/null)"
+        _ZFS_BRANCH="${_ZFS_BRANCH%/}"        #Remove tailing '/' if exists
+
+        [ "${_CURRENT_HOST}" != "${CIS[HOST]:?"Missing CIS_HOST"}" ] \
+            && printf %b "ZFS will be skipped, because this host '${CIS[HOST]}' is not running the composition:\n" >&2 \
+            && printf %b "  - Composition : ${_COMPOSITION}\n" >&2 \
+            && printf %b "  - Current host: ${_CURRENT_HOST}\n" >&2 \
+            && continue
+
+        _ZFS="$(zfs list -H -o name "${_ZFS_BRANCH:-"zpool1/persistent"}/${_COMPOSITION}" 2> /dev/null)"
+        [ -z "${_ZFS}" ] \
+            && printf %b "FAILURE - ZFS not found: ${_ZFS_BRANCH:-"zpool1/persistent"}/${_COMPOSITION}\n" >&2 \
+            && continue
+
+        (
+            flock -n 9 || return 1
+
+            case "${_MODE:?"Missing MODE"}" in
+                MINUTELY) zfs snapshot "${_ZFS}@SNAPMINUTELY_${_MINUTE}" 2> /dev/null \
+                              && echo "Snapshot created: '${_ZFS}@SNAPMINUTELY_${_MINUTE}'" >&2 ;& # Forces execution to continue in the next block
+                HOURLY)   zfs snapshot "${_ZFS}@SNAPHOURLY_${_HOUR}" 2> /dev/null \
+                              && echo "Snapshot created: '${_ZFS}@SNAPHOURLY_${_HOUR}'" >&2 ;&
+                DAILY)    zfs snapshot "${_ZFS}@SNAPDAILY_${_DAY}" 2> /dev/null \
+                              && echo "Snapshot created: '${_ZFS}@SNAPDAILY_${_DAY}'" >&2 ;&
+                MONTHLY)  zfs snapshot "${_ZFS}@SNAPMONTHLY_${_MONTH}" 2> /dev/null \
+                              && echo "Snapshot created: '${_ZFS}@SNAPMONTHLY_${_MONTH}'" >&2 ;;
+                NONE)     ;;
+                *)        echo "No valid mode to create snapshots: '${_MODE}'" >&2 ;;
+            esac
+
+        ) 9>>/tmp/locks/snapshot.${_COMPOSITION}.lock
+   done
+}
+
+
+
+# Parameter 1: Only one of these values (MINUTELY, HOURLY, DAILY, MONTHLY, NONE) are allowed, or empty.
+base.set MODE "${1}" '^(MINUTELY|HOURLY|DAILY|MONTHLY|NONE)?$' || exit 1
+
+snapshot "${MODE}"
+cleanup
+
+exit 0