diff --git a/package_check.sh b/package_check.sh
index f5016a1..7da2a9a 100755
--- a/package_check.sh
+++ b/package_check.sh
@@ -177,6 +177,26 @@ fi
 # Create the lock file
 touch "$lock_file"
 
+#=================================================
+# Check the internet connectivity
+#=================================================
+
+# Try to ping yunohost.org
+ping -q -c 2 yunohost.org > /dev/null 2>&1
+if [ "$?" -ne 0 ]; then
+	# If fail, try to ping another domain
+	ping -q -c 2 framasoft.org > /dev/null 2>&1
+	if [ "$?" -ne 0 ]; then
+		# If ping failed twice, it's seems the internet connection is down.
+		echo "\e[91mUnable to connect to internet.\e[0m"
+
+		# Remove the lock file
+		rm -f "$lock_file"
+		# And exit
+		exit 1
+	fi
+fi
+
 #=================================================
 # Upgrade Package check
 #=================================================
@@ -328,26 +348,6 @@ else
 	echo -e "\e[93mUnable to define the user who authorised to use package check. Please fill the file $setup_user_file\e[0m"
 fi
 
-#=================================================
-# Check the internet connectivity
-#=================================================
-
-# Try to ping yunohost.org
-ping -q -c 2 yunohost.org > /dev/null 2>&1
-if [ "$?" -ne 0 ]; then
-	# If fail, try to ping another domain
-	ping -q -c 2 framasoft.org > /dev/null 2>&1
-	if [ "$?" -ne 0 ]; then
-		# If ping failed twice, it's seems the internet connection is down.
-		echo "\e[91mUnable to connect to internet.\e[0m"
-
-		# Remove the lock file
-		rm -f "$lock_file"
-		# And exit
-		exit 1
-	fi
-fi
-
 #=================================================
 # Define globals variables
 #=================================================
@@ -682,6 +682,14 @@ TEST_RESULTS () {
 		fi
 	done
 
+	# If some witness files was missing, it's a big error ! So, the level fall immediately at 0.
+	if [ $RESULT_witness -eq 1 ]
+	then
+		ECHO_FORMAT "Some witness files has been deleted during those tests ! It's a very bad thing !\n" "red" "bold"
+		global_level=0
+	fi
+
+
 	# Then, print the levels
 	# Print the global level
 	ECHO_FORMAT "Level of this application: $global_level\n" "white" "bold"
@@ -731,6 +739,7 @@ LXC_INIT
 # Default values for check_process and TESTING_PROCESS
 initialize_values() {
 	# Test results
+	RESULT_witness=0
 	RESULT_linter=0
 	RESULT_global_setup=0
 	RESULT_global_remove=0
diff --git a/sub_scripts/launcher.sh b/sub_scripts/launcher.sh
index cff0719..9885d9a 100755
--- a/sub_scripts/launcher.sh
+++ b/sub_scripts/launcher.sh
@@ -42,8 +42,10 @@ LXC_START () {
 		if ! is_lxc_running; then
 			echo -n "Start the LXC container" | tee --append "$test_result"
 			sudo lxc-start --name=$lxc_name --daemon --logfile "$script_dir/lxc_boot.log" | tee --append "$test_result" 2>&1
+			local avoid_witness=0
 		else
 			echo -n "A LXC container is already running" | tee --append "$test_result"
+			local avoid_witness=1
 		fi
 
 		# Check during 20 seconds if the container has finished to start.
@@ -79,6 +81,9 @@ LXC_START () {
 			fi
 			LXC_STOP	# Stop the LXC container
 		else
+			# Create files to check if the remove script does not remove them accidentally
+			[ $avoid_witness -eq 0 ] && set_witness_files
+
 			# Break the for loop if the container is ready.
 			break
 		fi
@@ -86,7 +91,7 @@ LXC_START () {
 		# Fail if the container failed to start
 		if [ $i -eq $max_try ] && [ $failstart -eq 1 ]
 		then
-			ECHO_FORMAT "The container failed to start $max_try times...\nIf this problem is persistent, try to fix it with lxc_check.sh." "red" "bold"
+			ECHO_FORMAT "The container failed to start $max_try times...\nIf this problem is persistent, try to fix it with lxc_check.sh.\n" "red" "bold"
 			ECHO_FORMAT "Boot log:\n" clog
 			cat "$script_dir/lxc_boot.log" | tee --append "$test_result"
 			return 1
diff --git a/sub_scripts/testing_process.sh b/sub_scripts/testing_process.sh
index a7aca4f..c0a5077 100644
--- a/sub_scripts/testing_process.sh
+++ b/sub_scripts/testing_process.sh
@@ -41,6 +41,9 @@ SETUP_APP () {
 		ECHO_FORMAT "Installation failed. ($yunohost_result)\n" "white" clog
 	fi
 
+	# Check all the witness files, to verify if them still here
+	check_witness_files
+
 	# Retrieve the app id in the log. To manage the app after
 	ynh_app_id=$(sudo tac "$yunohost_log" | grep --only-matching --max-count=1 "YNH_APP_INSTANCE_NAME=[^ ]*" | cut --delimiter='=' --fields=2)
 }
@@ -65,6 +68,9 @@ REMOVE_APP () {
 	else
 		ECHO_FORMAT "Deleting failed. ($yunohost_remove)\n" "white" clog
 	fi
+
+	# Check all the witness files, to verify if them still here
+	check_witness_files
 }
 
 #=================================================
@@ -474,6 +480,9 @@ CHECK_UPGRADE () {
 			ECHO_FORMAT "Upgrade failed. ($yunohost_result)\n" "white" clog
 		fi
 
+		# Check all the witness files, to verify if them still here
+		check_witness_files
+
 		# Analyse the log to extract "warning" and "error" lines
 		LOG_EXTRACTOR
 
@@ -916,6 +925,9 @@ CHECK_BACKUP_RESTORE () {
 				ECHO_FORMAT "Backup failed. ($yunohost_result)\n" "white" clog
 			fi
 
+			# Check all the witness files, to verify if them still here
+			check_witness_files
+
 			# Analyse the log to extract "warning" and "error" lines
 			LOG_EXTRACTOR
 		fi
@@ -974,6 +986,9 @@ CHECK_BACKUP_RESTORE () {
 				ECHO_FORMAT "Restore failed. ($yunohost_result)\n" "white" clog
 			fi
 
+			# Check all the witness files, to verify if them still here
+			check_witness_files
+
 			# Analyse the log to extract "warning" and "error" lines
 			LOG_EXTRACTOR
 
@@ -1041,6 +1056,109 @@ TEST_LAUNCHER () {
 	LXC_STOP
 }
 
+set_witness_files () {
+	# Create files to check if the remove script does not remove them accidentally
+	echo -n "Create witness files" | tee --append "$test_result"
+
+	lxc_dir="/var/lib/lxc/$lxc_name/rootfs"
+
+	create_witness_file () {
+		[ "$2" = "file" ] && local action="touch" || local action="mkdir -p"
+		sudo $action "${lxc_dir}${1}"
+	}
+
+	# Nginx conf
+	create_witness_file "/etc/nginx/conf.d/$main_domain.d/witnessfile.conf" file
+	create_witness_file "/etc/nginx/conf.d/$sub_domain.d/witnessfile.conf" file
+
+	# /etc
+	create_witness_file "/etc/witnessfile" file
+
+	# /opt directory
+	create_witness_file "/opt/witnessdir" directory
+
+	# /var/www directory
+	create_witness_file "/var/www/witnessdir" directory
+
+	# /home/yunohost.app/
+	create_witness_file "/home/yunohost.app/witnessdir" directory
+
+	# /var/log
+	create_witness_file "/var/log/witnessfile" file
+
+	# Config fpm
+	create_witness_file "/etc/php5/fpm/pool.d/witnessfile.conf" file
+
+	# Config logrotate
+	create_witness_file "/etc/logrotate.d/witnessfile" file
+
+	# Config systemd
+	create_witness_file "/etc/systemd/system/witnessfile.service" file
+
+	# Database
+	for timeout in `seq 1 10`
+	do
+		sudo lxc-attach --name=$lxc_name -- mysql --user=root --password=$(sudo cat "$lxc_dir/etc/yunohost/mysql") --wait --execute="CREATE DATABASE witnessdb" > /dev/null 2>&1 && break
+		echo -n "."
+		sleep 1
+	done
+	echo ""
+}
+
+check_witness_files () {
+	# Check all the witness files, to verify if them still here
+
+	lxc_dir="/var/lib/lxc/$lxc_name/rootfs"
+
+	check_file_exist () {
+		if sudo test ! -e "${lxc_dir}${1}"
+		then
+			ECHO_FORMAT "The file $1 is missing ! Something gone wrong !\n" "red" "bold"
+			RESULT_witness=1
+		fi
+	}
+
+	# Nginx conf
+	check_file_exist "/etc/nginx/conf.d/$main_domain.d/witnessfile.conf"
+	check_file_exist "/etc/nginx/conf.d/$sub_domain.d/witnessfile.conf"
+
+	# /etc
+	check_file_exist "/etc/witnessfile"
+
+	# /opt directory
+	check_file_exist "/opt/witnessdir"
+
+	# /var/www directory
+	check_file_exist "/var/www/witnessdir"
+
+	# /home/yunohost.app/
+	check_file_exist "/home/yunohost.app/witnessdir"
+
+	# /var/log
+	check_file_exist "/var/log/witnessfile"
+
+	# Config fpm
+	check_file_exist "/etc/php5/fpm/pool.d/witnessfile.conf"
+
+	# Config logrotate
+	check_file_exist "/etc/logrotate.d/witnessfile"
+
+	# Config systemd
+	check_file_exist "/etc/systemd/system/witnessfile.service"
+
+	# Database
+	if ! sudo lxc-attach --name=$lxc_name -- mysqlshow --user=root --password=$(sudo cat "$lxc_dir/etc/yunohost/mysql") | grep --quiet '^| witnessdb' > /dev/null 2>&1
+	then
+		ECHO_FORMAT "The database witnessdb is missing ! Something gone wrong !\n" "red" "bold"
+		RESULT_witness=1
+	fi
+	if [ $RESULT_witness -eq 1 ]
+	then
+		yunohost_result=1
+		yunohost_remove=1
+	fi
+}
+
 TESTING_PROCESS () {
 	# Launch all tests successively