diff --git a/core/base.module.sh b/core/base.module.sh
index cf7f448..ef39411 100755
--- a/core/base.module.sh
+++ b/core/base.module.sh
@@ -196,6 +196,7 @@ function prepare.setREGEX() {
     REGEX[DIRPATH]='/([a-zA-Z0-9._-]+/)*'
     REGEX[HOST]='[a-zA-Z0-9]([a-zA-Z0-9.-]*[a-zA-Z0-9])?'
     REGEX[PORT]='[0-9]{1,5}'
+    REGEX[RESUMETOKEN]='[0-9][A-Za-z0-9_-]+'
     REGEX[SNAPSHOT]='@[a-zA-Z]([a-zA-Z0-9.:_-]*[a-zA-Z0-9])?'
     REGEX[SYNCSNAPSHOT]='@SYNC_[a-zA-Z0-9.:_-]*[a-zA-Z0-9]'
     REGEX[USER]='[a-zA-Z]([a-zA-Z0-9._-]*[a-zA-Z0-9])?'
diff --git a/script/host/zfs/composition-sync/sync-send.sh b/script/host/zfs/composition-sync/sync-send.sh
index f9384f4..acf9dca 100755
--- a/script/host/zfs/composition-sync/sync-send.sh
+++ b/script/host/zfs/composition-sync/sync-send.sh
@@ -43,13 +43,9 @@ function printFoundCommonSnapshot() {
     local _ZFS _RECEIVERHOST _COMMON_SNAPSHOT_CANDIDATE
     _ZFS="${1:?"printFoundCommonSnapshot(): Missing first parameter ZFS"}"
     _RECEIVERHOST="${2:?"printFoundCommonSnapshot(): Missing second parameter RECEIVERHOST"}"
-    _COMMON_SNAPSHOT_CANDIDATE="@${3#*@}"
+    _COMMON_SNAPSHOT_CANDIDATE="${3:?"printFoundCommonSnapshot(): Missing third parameter COMMON_SNAPSHOT_CANDIDATE"}"
     readonly _ZFS _RECEIVERHOST _COMMON_SNAPSHOT_CANDIDATE
 
-    # Nothing to do
-    [ "${_COMMON_SNAPSHOT_CANDIDATE}" == "@" ] \
-        && return 0
-
     while read -r _ROW
     do
         if [ "${_ROW}" == "${_ZFS}${_COMMON_SNAPSHOT_CANDIDATE}" ]; then
@@ -84,37 +80,33 @@ function removeReceiverhostsSyncSnapshotsExeptTheCommonOne() {
     done < <(zfs list -H -o name -S creation -t snapshot "${_ZFS}" | grep -E "^${_ZFS}@SYNC_${_RECEIVERHOST}_")
 }
 
-function sendResume() {
-    local _RESUME_TOKEN
-    _RESUME_TOKEN="${1:?"sendResume(): Missing first parameter RESUME_TOKEN"}"
-    readonly _RESUME_TOKEN
-
-    zfs send -t "${_RESUME_TOKEN:?"Missing RESUME_TOKEN"}" \
-        && return 0
-
-    return 1
-}
-
 function send() {
-    local _COMPOSITION _RECEIVERHOST _RECEIVERS_SNAPSHOT _NOW _ZFS _NEW_SNAPSHOT
+    local _COMPOSITION _RECEIVERHOST _RECEIVERS_SNAPSHOT _RESUME_TOKEN _NOW _ZFS _NEW_SNAPSHOT
     _COMPOSITION="${1:?"send(): Missing first parameter COMPOSITION"}"
     _RECEIVERHOST="${2:?"send(): Missing second parameter RECEIVERHOST"}"
-    _RECEIVERS_SNAPSHOT="${3}"
+    _RECEIVERS_SNAPSHOT="${3:?"send(): Missing third parameter RECEIVERS_SNAPSHOT"}"
+    _RESUME_TOKEN="${4}"
     _NOW=$(date -u "+%Y-%m-%d_%H:%M:%SZ")
     _ZFS=$(composition.printZfsVerified "${_COMPOSITION}")
     _NEW_SNAPSHOT="${_ZFS:?"Missing ZFS"}@SYNC_${_RECEIVERHOST:?"Missing RECEIVERHOST"}_${_NOW:?"Missing NOW"}"
-    readonly _COMPOSITION _RECEIVERHOST _RECEIVERS_SNAPSHOT _NOW _NEW_SNAPSHOT
+    readonly _COMPOSITION _RECEIVERHOST _RECEIVERS_SNAPSHOT _RESUME_TOKEN _NOW _NEW_SNAPSHOT
+
+    [ "${RECEIVERS_SNAPSHOT}" == '@REPLICATION' ] \
+        && [ -z "${RESUME_TOKEN}" ] \
+        && zfs snapshot "${_NEW_SNAPSHOT}" \
+        && zfs send -c -R "${_NEW_SNAPSHOT}" \
+        && return 0
+
+    [ "${RECEIVERS_SNAPSHOT}" == '@RESUME' ] \
+        && [ -n "${RESUME_TOKEN}" ] \
+        && zfs send -t "${_RESUME_TOKEN}" \
+        && return 0
 
     # This common snapshot is the starting-point, if available.
     ! _COMMON_SNAPSHOT=$(printFoundCommonSnapshot "${_ZFS}" "${_RECEIVERHOST}" "${_RECEIVERS_SNAPSHOT}") \
         && echo "Failure in sync-send.sh: abort" >&2 \
         && return 1
 
-    [ "${_COMMON_SNAPSHOT}" == "" ] \
-        && zfs snapshot "${_NEW_SNAPSHOT}" \
-        && zfs send -c -R "${_NEW_SNAPSHOT}" \
-        && return 0
-
     [ "${_COMMON_SNAPSHOT}" != "" ] \
         && removeReceiverhostsSyncSnapshotsExeptTheCommonOne "${_ZFS}" "${_RECEIVERHOST}" "${_COMMON_SNAPSHOT}" \
         && zfs snapshot "${_NEW_SNAPSHOT}" \
@@ -126,28 +118,16 @@ function send() {
 
 
 
-# Parameter 1: Only alphanumeric characters allowed and [.-]   if not leading (due to: -oProxyCommand=...).
-# Parameter 2: Only alphanumeric characters allowed and [._-]  if not leading (due to: -oProxyCommand=...).
-# Parameter 3: Only alphanumeric characters allowed and [._:-] if not leading (due to: -oProxyCommand=...), but can be empty.
-# Parameter 4: Only alphanumeric characters allowed and [._:-] if not leading (due to: -oProxyCommand=...), but can be empty.
-base.set COMPOSITION "${1}" "${REGEX[COMPOSITION]}"
-base.set RECEIVERHOST "${2}" "${REGEX[HOST]}"
-base.set RECEIVERS_SNAPSHOT "${3}" "${REGEX[SNAPSHOT]}" optional
-base.set RESUME_TOKEN "${4}" '^[a-zA-Z0-9][a-zA-Z0-9._:-]*$' optional
+base.set COMPOSITION        "${1}" "${REGEX[COMPOSITION]}"
+base.set RECEIVERHOST       "${2}" "${REGEX[HOST]}"
+base.set RECEIVERS_SNAPSHOT "${3}" "${REGEX[SNAPSHOT]}"
+base.set RESUME_TOKEN       "${4}" "${REGEX[RESUMETOKEN]}" optional
 
 ! composition.shouldBeSyncedByGivenHost "${COMPOSITION}" "${RECEIVERHOST}" \
     && base.abort "no sync-host available" \
         "Host '${RECEIVERHOST}' is no sync-host for composition: '${COMPOSITION}'"
 
-# Resume mode
-if [ "${RECEIVERS_SNAPSHOT}" == '@RESUME' ] && [ -n "${RESUME_TOKEN}" ]; then
-    sendResume "${RESUME_TOKEN}"
-
-    # Exit preserving the code
-    exit $?
-fi
-
-send "${COMPOSITION}" "${RECEIVERHOST}" "${RECEIVERS_SNAPSHOT}" \
+send "${COMPOSITION}" "${RECEIVERHOST}" "${RECEIVERS_SNAPSHOT}" "${RESUME_TOKEN}" \
     && exit 0
 
 print.failure "Something unexpected happend."
diff --git a/script/host/zfs/composition-sync/sync.sh b/script/host/zfs/composition-sync/sync.sh
index a0cfe20..8a976b9 100755
--- a/script/host/zfs/composition-sync/sync.sh
+++ b/script/host/zfs/composition-sync/sync.sh
@@ -41,7 +41,7 @@ function removeForeignSyncSnapshots() {
     zfs list -t snapshot -H -o name "${_ZFS}" | grep -- "${_ZFS}@SYNC" | grep -v -i "@SYNC_${_RECEIVERHOST}_" | while read _SNAP; do
     print.data "Removing foreign snapshot:  ${_SNAP} ... " \
         && destroySyncSnapshot "${_ZFS}" "${_SNAP}" \
-        && print.good "done\n"
+        && print.done
     done
 
     return 0
@@ -61,7 +61,7 @@ function removeOutdatedSyncSnapshots() {
     zfs list -t snapshot -H -o name "${_ZFS}" | grep -- "${_ZFS}@SYNC_${_RECEIVERHOST}_" | grep -v -i "${_NEWEST_SNAPSHOT}" | while read _SNAP; do
     print.data "Removing outdated snapshot: ${_SNAP} ... " \
         && destroySyncSnapshot "${_ZFS}" "${_SNAP}" \
-        && print.good "done\n"
+        && print.done
     done
 
     return 0
@@ -102,7 +102,7 @@ function receive() {
     (
         flock -n 9 || exit 1
 
-        _COMMON_SNAPSHOT=""
+        local _COMMON_SNAPSHOT _RESUME_TOKEN
         _RESUME_TOKEN=$(zfs get -H -o value receive_resume_token "${_ZFS_BACKUP}" 2> /dev/null)
         if [ -n "${_RESUME_TOKEN}" ] && [ "${_RESUME_TOKEN}" != "-" ]; then
             print.important "Resume token present trying to resume at ${_RESUME_TOKEN}\n"
@@ -110,11 +110,16 @@ function receive() {
         else
             _RESUME_TOKEN=""
             _COMMON_SNAPSHOT=$(zfs list -H -o name -S creation -t snapshot "${_ZFS_BACKUP}" 2> /dev/null | head -n 1)
-            [ -n "${_COMMON_SNAPSHOT}" ] \
-                && print.data "Rolling back to newest snapshot: ${_COMMON_SNAPSHOT} ... " \
+            if [ -n "${_COMMON_SNAPSHOT}" ]; then
+                print.data "Newest snapshot found, rolling back: ${_COMMON_SNAPSHOT} ... " \
                 && zfs rollback -r "${_COMMON_SNAPSHOT}" \
                 && _COMMON_SNAPSHOT="@${_COMMON_SNAPSHOT#*@}" \
-                && print.good "done\n"
+                && print.done
+            else 
+                print.data "No snapshot found, prepare replication ... " \
+                && _COMMON_SNAPSHOT='@REPLICATION' \
+                && print.done
+            fi
         fi
 
         # Add "-s" for resumable streams in the next line at zfs receive. Not done yet because of: cannot receive resume stream: kernel modules must be upgraded to receive this stream.
@@ -223,7 +228,7 @@ function usage() {
 
 
 # Parameter 2: only a subset of alphanumeric characters are allowed and [_-] if not leading (due to: -oProxyCommand=...).
-base.set COMPOSITION "${2}" '^[a-zA-Z0-9][a-zA-Z0-9_-]*$' optional
+base.set COMPOSITION "${2}" "${REGEX[COMPOSITION]}" optional
 
 case "${1}" in
     --onceAll)