diff --git a/zzz_evobackup b/zzz_evobackup
index dee3cc0..0fe145a 100755
--- a/zzz_evobackup
+++ b/zzz_evobackup
@@ -2,7 +2,7 @@
 #
 # Script Evobackup client
 # See https://gitea.evolix.org/evolix/evobackup
-# 
+#
 # Author: Gregory Colpart <reg@evolix.fr>
 # Contributors:
 # Romain Dessort <rdessort@evolix.fr>
@@ -42,6 +42,7 @@ if [ -e $PIDFILE ]; then
     echo "$0 tourne encore (PID $pid). Processus killé" >&2
 fi
 echo "$$" > $PIDFILE
+# shellcheck disable=SC2064
 trap "rm -f $PIDFILE" EXIT
 
 # email adress for notifications
@@ -55,12 +56,12 @@ SSH_CONNECT_TIMEOUT=10
 
 test_server() {
     item=$1
-    host=$(echo ${item} | cut -d':' -f1)
-    port=$(echo ${item} | cut -d':' -f2)
+    host=$(echo "${item}" | cut -d':' -f1)
+    port=$(echo "${item}" | cut -d':' -f2)
 
     # Test if the server is accepting connections
-    ssh -q -o "ConnectTimeout ${SSH_CONNECT_TIMEOUT}" ${host} -p ${port} -t "exit"
-
+    ssh -q -o "ConnectTimeout ${SSH_CONNECT_TIMEOUT}" "${host}" -p "${port}" -t "exit"
+    # shellcheck disable=SC2181
     if [ $? = 0 ]; then
         return 0
     else
@@ -78,7 +79,7 @@ pick_server() {
     fi
 
     salt=$(hostname | cksum | cut -d' ' -f1)
-    item=$(echo $(( ($(date +%d) + salt + inc) % list_length )))
+    item=$(( ($(date +%d) + salt + inc) % list_length ))
     field=$(( item + 1 ))
 
     echo "${SERVERS}" | cut -d' ' -f${field}
@@ -98,11 +99,11 @@ while :; do
     fi
 done
 
-SSH_SERVER=$(echo $SERVER | cut -d':' -f1)
-SSH_PORT=$(echo $SERVER | cut -d':' -f2)
+SSH_SERVER=$(echo "${SERVER}" | cut -d':' -f1)
+SSH_PORT=$(echo "${SERVER}" | cut -d':' -f2)
 
 ## We use /home/backup : feel free to use your own dir
-LOCAL_BACKUP_DIR=/home/backup
+LOCAL_BACKUP_DIR="/home/backup"
 # shellcheck disable=SC2174
 mkdir -p -m 700 ${LOCAL_BACKUP_DIR}
 
@@ -285,7 +286,7 @@ rsync -avzh --stats --delete --delete-excluded --force --ignore-errors --partial
     --exclude "/var/lib/clamav/*.tmp"                  \
     --exclude "/home/mysqltmp"                         \
     --exclude "/var/lib/php/sessions"                  \
-        ${rep}                                         \
+        "${rep}"                                       \
         /etc                                           \
         /root                                          \
         /var                                           \