diff --git a/lib/analyze_test_results.py b/lib/analyze_test_results.py
index 4a72a13..cc7cbe7 100644
--- a/lib/analyze_test_results.py
+++ b/lib/analyze_test_results.py
@@ -168,8 +168,7 @@ test_types = {
 OK = ' \033[1m\033[92mOK\033[0m '
 FAIL = '\033[91mfail\033[0m'
 
-print("Tests summary")
-print("=============")
+print()
 for test in tests:
     test_display_name = test_types[test["test_type"]]
     if test["test_arg"]:
diff --git a/lib/lxc.sh b/lib/lxc.sh
index 2524245..f22d098 100644
--- a/lib/lxc.sh
+++ b/lib/lxc.sh
@@ -14,7 +14,7 @@ LXC_CREATE () {
 }
 
 LXC_SNAPSHOT_EXISTS() {
-    lxc info $LXC_NAME 2>/dev/null | grep -A10 Snapshots | tail -n -1 | awk '{print $1}' | grep -q -w "$1"
+    sudo lxc info $LXC_NAME 2>/dev/null | grep -A10 Snapshots | tail -n -1 | awk '{print $1}' | grep -q -w "$1"
 }
 
 CREATE_LXC_SNAPSHOT () {
@@ -36,7 +36,7 @@ CREATE_LXC_SNAPSHOT () {
     # Check if the snapshot already exist
     if ! LXC_SNAPSHOT_EXISTS "$snapname"
     then
-        log_debug "$snapname doesn't exist, its first creation can takes a little while." >&2
+        log_debug "Creating snapshot $snapname ..."
         sudo lxc snapshot $LXC_NAME $snapname
     fi
 
@@ -45,6 +45,7 @@ CREATE_LXC_SNAPSHOT () {
 
 LOAD_LXC_SNAPSHOT () {
     snapname=$1
+    log_debug "Loading snapshot $snapname ..."
     sudo lxc stop --timeout 15 $LXC_NAME 2>/dev/null
     sudo lxc restore $LXC_NAME $snapname
     sudo lxc start $LXC_NAME
diff --git a/lib/tests.sh b/lib/tests.sh
index b99d327..a661eb2 100644
--- a/lib/tests.sh
+++ b/lib/tests.sh
@@ -67,15 +67,15 @@ _LOAD_SNAPSHOT_OR_INSTALL_APP () {
     local _install_type=$(path_to_install_type $check_path)
     local snapname="snap_${_install_type}install"
 
-    if [ ! -e "$LXC_SNAPSHOTS/$snapname" ]
+    if ! LXC_SNAPSHOT_EXISTS $snapname
     then
         LOAD_LXC_SNAPSHOT snap0 \
             &&_INSTALL_APP "path=$check_path" \
-            && log_debug "Creating a snapshot for $_install_type installation." \
+            && log_debug "(Creating a snapshot for $_install_type installation.)" \
             && CREATE_LXC_SNAPSHOT $snapname
     else
         # Or uses an existing snapshot
-        log_debug "Reusing an existing snapshot for $_install_type installation." \
+        log_debug "(Reusing an existing snapshot for $_install_type installation.)" \
             && LOAD_LXC_SNAPSHOT $snapname
     fi
 }
@@ -315,7 +315,7 @@ _TEST_MULTI_INSTANCE () {
     LOAD_LXC_SNAPSHOT snap0
 
     log_small_title "First installation: path=$DOMAIN$check_path" \
-        &&_INSTALL_APP "domain=$DOMAIN" "path=$check_path" \
+        && _LOAD_SNAPSHOT_OR_INSTALL_APP "$check_path" \
         && log_small_title "Second installation: path=$SUBDOMAIN$check_path" \
         && _INSTALL_APP "path=$check_path" \
         && _VALIDATE_THAT_APP_CAN_BE_ACCESSED $DOMAIN $check_path \
@@ -470,7 +470,7 @@ TEST_BACKUP_RESTORE () {
             RUN_INSIDE_LXC rm -f /rootfs/home/yunohost.backup/archives/*
 
             # Place the copy of the backup archive in the container.
-            sudo lxc file push -r ./ynh_backups $LXC_NAME/home/yunohost.backup/archives/
+            sudo lxc file push -r ./ynh_backups/archives/* $LXC_NAME/home/yunohost.backup/archives/
             RUN_INSIDE_LXC ls -l /home/yunohost.backup/archives/
 
             log_small_title "Restore on a clean YunoHost system..."
diff --git a/lib/tests_coordination.sh b/lib/tests_coordination.sh
index 0e9cab2..942daa5 100644
--- a/lib/tests_coordination.sh
+++ b/lib/tests_coordination.sh
@@ -84,10 +84,10 @@ parse_check_process() {
         local configpanel_infos=$(  extract_check_process_section "^; Config_panel" "^; " $test_serie_rawconf)
 
         # Add (empty) special args if they ain't provided in check_process
-        echo "$install_args" | tr '&' '\n' | grep -q "^domain="    ||install_args+="&domain="
-        echo "$install_args" | tr '&' '\n' | grep -q "^path="      ||install_args+="&path="
-        echo "$install_args" | tr '&' '\n' | grep -q "^admin="     ||install_args+="&admin="
-        echo "$install_args" | tr '&' '\n' | grep -q "^is_public=" ||install_args+="&is_public="
+        echo "$install_args" | tr '&' '\n' | grep -q "^domain="    ||install_args+="domain=&"
+        echo "$install_args" | tr '&' '\n' | grep -q "^path="      ||install_args+="path=&"
+        echo "$install_args" | tr '&' '\n' | grep -q "^admin="     ||install_args+="admin=&"
+        echo "$install_args" | tr '&' '\n' | grep -q "^is_public=" ||install_args+="is_public=&"
 
         extract_check_process_section "^; Checks"       "^; " $test_serie_rawconf > $TEST_CONTEXT/check_process.tests_infos
 
@@ -142,7 +142,7 @@ parse_check_process() {
             grep "^upgrade=1" "$TEST_CONTEXT/check_process.tests_infos" |
             while IFS= read -r LINE;
             do
-                commit=$(echo $LINE | grep -o "from_commit=.*" | awk -F= '{print $2}')
+                commit="$(echo $LINE | grep -o "from_commit=.*" | awk -F= '{print $2}')"
                 [ -n "$commit" ] || continue
                 add_test "TEST_UPGRADE" "$commit"
             done
@@ -164,7 +164,7 @@ parse_check_process() {
         grep "^upgrade=1" "$TEST_CONTEXT/check_process.tests_infos" |
         while IFS= read -r LINE;
         do
-            commit=$(echo $LINE | grep -o "from_commit=.*" | awk -F= '{print $2}')
+            commit="$(echo $LINE | grep -o "from_commit=.*" | awk -F= '{print $2}')"
             add_test "TEST_UPGRADE" "$commit"
         done
 
@@ -281,6 +281,8 @@ run_all_tests() {
     done
 
     # Print the final results of the tests
+    log_title "Tests summary"
+    
     python3 lib/analyze_test_results.py $TEST_CONTEXT 2>$TEST_CONTEXT/summary.json
 
     # Restore the started time for the timer