diff --git a/bin/setup_backup.sh b/bin/setup_backup.sh
index ee14815..fc7356e 100644
--- a/bin/setup_backup.sh
+++ b/bin/setup_backup.sh
@@ -1,16 +1,21 @@
 #!/bin/bash
 
-. bin/setup_ssh_keys.sh
+if [[ -n "$RECEIVING_IP" && -n "$RECEIVING_USER" && -n "$RECEIVING_PORT" ]]; then
+    if ssh -p $RECEIVING_PORT -q -o BatchMode=yes -o ConnectTimeout=5 $RECEIVING_USER@$RECEIVING_IP exit; then
+        install_pkg cron
 
-install_pkg cron
+        cp ./assets/backup.sh ~/backup.sh
+        chmod +x ~/backup.sh
 
-cp ./assets/backup.sh ~/backup.sh
-chmod +x ~/backup.sh
+        sed -i "s/^receiving_ip=.*/receiving_ip=$RECEIVING_IP/" ~/backup.sh
+        sed -i "s/^receiving_user=.*/receiving_user=$RECEIVING_USER/" ~/backup.sh
+        sed -i "s/^receiving_port=.*/receiving_port=$RECEIVING_PORT/" ~/backup.sh
 
-sed -i "s/^receiving_ip=.*/receiving_ip=$RECEIVING_IP/" ~/backup.sh
-sed -i "s/^receiving_user=.*/receiving_user=$RECEIVING_USER/" ~/backup.sh
-sed -i "s/^receiving_port=.*/receiving_port=$RECEIVING_PORT/" ~/backup.sh
+        cronjob="0 2 * * * ~/backup.sh"
 
-cronjob="0 2 * * * ~/backup.sh"
-
-( crontab -l 2>/dev/null; echo "$cronjob" ) | crontab -
\ No newline at end of file
+        ( crontab -l 2>/dev/null; echo "$cronjob" ) | crontab -
+    fi
+else
+    . bin/setup_ssh_keys.sh
+    . bin/setup_backup.sh
+fi
\ No newline at end of file
diff --git a/bin/setup_ssh_keys.sh b/bin/setup_ssh_keys.sh
index 21e28e1..e62d387 100644
--- a/bin/setup_ssh_keys.sh
+++ b/bin/setup_ssh_keys.sh
@@ -7,6 +7,15 @@ read RECEIVING_USER
 echo -e "${PURPLE}${BOLD}Enter the receiving server port : ${RESET}"
 read RECEIVING_PORT
 
-# si les ssh keys sont pas déjà set
-ssh-keygen
-ssh-copy-id -p ${RECEIVING_PORT} ${RECEIVING_USER}@${RECEIVING_IP}
\ No newline at end of file
+if [ ! -f ~/.ssh/id_rsa ]; then
+    ssh-keygen -t rsa -b 2048 -N "" -f ~/.ssh/id_rsa
+fi
+ssh-copy-id -p ${RECEIVING_PORT} ${RECEIVING_USER}@${RECEIVING_IP}
+
+hostname=$(hostname)
+
+ssh -p $RECEIVING_PORT $RECEIVING_USER@$RECEIVING_IP << EOF
+    awk '/${hostname}$/ {last=\$0; count++} {lines[NR]=\$0} END {for (i=1; i<=NR; i++) if (lines[i] !~ /$(hostname)$/ || count-- == 1) print lines[i]}' /home/${RECEIVING_USER}/.ssh/authorized_keys
+    > /home/${RECEIVING_USER}/.ssh/authorized_keys.tmp
+    && mv /home/${RECEIVING_USER}/.ssh/authorized_keys.tmp /home/${RECEIVING_USER}/.ssh/authorized_keys
+EOF
\ No newline at end of file