diff --git a/drop-caches b/drop-caches
new file mode 100755
index 0000000..c6f10e6
--- /dev/null
+++ b/drop-caches
@@ -0,0 +1,4 @@
+#!/bin/bash
+# Used by the mirroring user to refresh the nfs cache before doing a mirroring run.
+
+echo 3 >/proc/sys/vm/drop_caches
diff --git a/mirror b/mirror
index 3a28814..201a4c0 100755
--- a/mirror
+++ b/mirror
@@ -17,7 +17,7 @@ MAX_RUNS="3"			# Maximum number of runs
 IPV4="5.101.171.215"
 DATADIR="/data/depository"
 RSYNC_COMMAND="/usr/bin/rsync"
-RSYNC_REMOTE_OPTIONS=('-4' "--address=$IPV4" '--no-motd' '--contimeout=30' '--timeout=60' '-aH' '--chmod=go-w,+rX' '--partial' '--partial-dir=.rsync-tmp' '--delete-delay' '--delay-updates')
+RSYNC_REMOTE_OPTIONS=('-4' "--address=$IPV4" '--no-motd' '--contimeout=30' '--timeout=60' '-aH' '--no-owner' '--no-group' '--chmod=go-w,+rX' '--partial' '--partial-dir=.rsync-tmp' '--delete-delay' '--delay-updates')
 RSYNC_LOCAL_OPTIONS=('-aH' '--chmod=go-w,+rX' '--partial' '--partial-dir=.rsync-tmp' '--delay-updates')
 # RSYNC_VERBOSE=('--verbose' '--human-readable')
 # RSYNC_VERBOSE=('--progress' '--verbose' '--stats' '--human-readable')
@@ -163,6 +163,24 @@ SLACKARCHIVE_FILTER=('--exclude=source/' '--include=/slackware-15.0' '--include=
 
 #######################################################################################################################################
 
+# Only allow the script to be run from the wrapper.
+[[ ! -v MIRRORING_USER ]] && {
+  echo "ERROR: this script should only be run by mirror-wrapper" >&2
+  exit 1
+}
+
+# Make sure the users match.
+[[ "$(whoami)" != "$MIRRORING_USER" ]] && {
+  echo "ERROR: this script should be run by the '$MIRRORING_USER' only - use su to run manually" >&2
+  exit 1
+}
+
+# Move to the depository directory.
+cd "$DATADIR" >/dev/null 2>&1 || {
+  echo "ERROR: $DATADIR does not exist." >&2
+  exit 1
+}
+
 # Only allow one copy of the script to run at any time.
 # shellcheck disable=SC2154
 if [[ "$FLOCK" != "$0" ]]; then
@@ -178,12 +196,6 @@ if [[ "$FLOCK" != "$0" ]]; then
   fi
 fi
 
-# Move to the depository directory.
-cd "$DATADIR" >/dev/null 2>&1 || {
-  echo "ERROR: $DATADIR does not exist." >&2
-  exit 1
-}
-
 # Variables
 declare -a LFTP_LIST RSYNC_LIST
 
diff --git a/mirror-wrapper b/mirror-wrapper
index 61be5f4..9f9c532 100755
--- a/mirror-wrapper
+++ b/mirror-wrapper
@@ -3,6 +3,10 @@
 
 # Configuration.
 COMMAND="/opt/bin/mirror"
+DEPOSITORY="/data/depository"
+MIRRORING_USER="mirroring"
+SBOSRCARCH_USER="sbosrcarch"
+DEPOSITORY_GROUP="depository"
 LOGSDIR="/var/log/duplication/mirroring/$(printf "%(%Y/%m)T")"
 LOGFILE="$(printf "%(%Y%m%d-%H%M%S)T")-$$"
 MIN_LOGFILE_SIZE="650"		# Used to prevent unnecessary emails - only messages over this size are sent.
@@ -22,9 +26,22 @@ notify() {
   return 0
 }
 
-# Don't run as root!
-(( $(id -u) == 0 )) && {
-  printf "%s: %s\\n" "${0##*/}" "don't run me as root - it messes up permissions!" >&2
+# Only run for the configured mirroring user.
+[[ "$(whoami)" != "$MIRRORING_USER" ]] && {
+  printf "%s: %s\\n" "${0##*/}" "must be run by the '$MIRRORING_USER' user - use su to run manually" >&2
+  exit 1
+}
+
+# Make sure the logs directory exists.
+# shellcheck disable=SC2174
+mkdir -p -m 750 "$LOGSDIR" 2>/dev/null || {
+  printf "%s: %s\\n" "${0##*/}" "Failed to create logs directory '$LOGSDIR'" >&2
+  exit 1
+}
+
+# Make sure the command to do the work is runnable.
+[[ ! -x "$COMMAND" ]] && {
+  printf "%s: %s\\n" "${0##*/}" "'$COMMAND' is not executable" >&2
   exit 1
 }
 
@@ -46,22 +63,22 @@ fi
 # Logs are only for root.
 umask 027
 
-# Make sure the logs directory exists.
-# shellcheck disable=SC2174
-mkdir -p -m 750 "$LOGSDIR" 2>/dev/null || {
-  printf "%s: %s\\n" "${0##*/}" "Failed to create logs directory '$LOGSDIR'" >&2
-  exit 1
-}
+# Drop the caches as sometimes old user/groups are cached.
+sudo /opt/sbin/drop-caches
 
-# Make sure the command to do the work is runnable.
-[[ ! -x "$COMMAND" ]] && {
-  printf "%s: %s\\n" "${0##*/}" "'$COMMAND' is not executable" >&2
-  exit 1
-}
-
-# Do the mirroring work.
-"$COMMAND" "$@" >"$LOGSDIR/$LOGFILE" 2>&1
-ERR="$?"
+# Make sure there's no errant ownerships.
+WRONG_PERMS="$(find "$DEPOSITORY" \( \( \! -user "$MIRRORING_USER" -a \! -user "$SBOSRCARCH_USER" \) -o \( \! -group "$DEPOSITORY_GROUP" \) \) -a \! -path "$DEPOSITORY" -printf "%u:%g\t%P\n")"
+if [[ -n "$WRONG_PERMS" ]]; then
+  printf "%s\\n" "This sync has been aborted!" >"$LOGSDIR/$LOGFILE"
+  printf "%s\\n" "The following files in have errant permissions:" >>"$LOGSDIR/$LOGFILE"
+  printf "%s\\n" "$WRONG_PERMS" >>"$LOGSDIR/$LOGFILE"
+  ERR=-1
+else
+  # Do the mirroring work.
+  export MIRRORING_USER
+  sg "$DEPOSITORY_GROUP" -c "$COMMAND" "$@" >"$LOGSDIR/$LOGFILE" 2>&1
+  ERR="$?"
+fi
 
 # Tell the sysadmin what went on.
 if (( "$ERR" == 0 )); then