diff --git a/13.0/pre_upgrade.sh b/13.0/pre_upgrade.sh
index 6a9d933..918dd2d 100755
--- a/13.0/pre_upgrade.sh
+++ b/13.0/pre_upgrade.sh
@@ -3,7 +3,7 @@
 echo "Prepare migration to 13.0..."
 
 # Copy database
-docker exec -u 70 "$DB_CONTAINER_NAME" pgm cp -f ou12 ou13@ou13
+copy_database ou12 ou13 ou13 || exit 1
 
 # Execute SQL pre-migration commands
 PRE_MIGRATE_SQL=$(cat <<'EOF'
diff --git a/14.0/pre_upgrade.sh b/14.0/pre_upgrade.sh
index 77c37ea..81048d5 100755
--- a/14.0/pre_upgrade.sh
+++ b/14.0/pre_upgrade.sh
@@ -3,7 +3,7 @@
 echo "Prepare migration to 14.0..."
 
 # Copy database
-docker exec -u 70 "$DB_CONTAINER_NAME" pgm cp -f ou13 ou14@ou14
+copy_database ou13 ou14 ou14 || exit 1
 
 # Execute SQL pre-migration commands
 PRE_MIGRATE_SQL=""
diff --git a/15.0/pre_upgrade.sh b/15.0/pre_upgrade.sh
index 59a9348..ced1d87 100755
--- a/15.0/pre_upgrade.sh
+++ b/15.0/pre_upgrade.sh
@@ -3,7 +3,7 @@
 echo "Prepare migration to 15.0..."
 
 # Copy database
-docker exec -u 70 "$DB_CONTAINER_NAME" pgm cp -f ou14 ou15@ou15
+copy_database ou14 ou15 ou15 || exit 1
 
 # Execute SQL pre-migration commands
 PRE_MIGRATE_SQL=$(cat <<'EOF'
diff --git a/16.0/pre_upgrade.sh b/16.0/pre_upgrade.sh
index b248ef1..051e83f 100755
--- a/16.0/pre_upgrade.sh
+++ b/16.0/pre_upgrade.sh
@@ -3,7 +3,7 @@
 echo "Prepare migration to 16.0..."
 
 # Copy database
-docker exec -u 70 "$DB_CONTAINER_NAME" pgm cp -f ou15 ou16@ou16
+copy_database ou15 ou16 ou16 || exit 1
 
 # Execute SQL pre-migration commands
 PRE_MIGRATE_SQL=$(cat <<'EOF'
diff --git a/upgrade.sh b/upgrade.sh
index 2990b3b..4c9684a 100755
--- a/upgrade.sh
+++ b/upgrade.sh
@@ -61,6 +61,15 @@ query_postgres_container(){
 }
 export -f query_postgres_container
 
+# Function to copy the postgres databases
+copy_database(){
+    local FROM_DB="$1"
+    local TO_SERVICE="$2"
+    local TO_DB="$3"
+    docker exec -u 70 "$POSTGRES_SERVICE_NAME" pgm cp -f "$FROM_DB" "$TO_DB"@"$TO_SERVICE"
+}
+export -f copy_database
+
 # Function to copy the filetores
 copy_filestore(){
     local FROM_SERVICE="$1"
@@ -126,7 +135,7 @@ echo "
 echo "UPGRADE: Start copy"
 
 # Copy database
-docker exec -u 70 $POSTGRES_SERVICE_NAME pgm cp -f "$ORIGIN_DB_NAME" "${COPY_DB_NAME}@${COPY_DB_NAME}" || exit 1
+copy_database "$ORIGIN_DB_NAME" "$COPY_DB_NAME" "$COPY_DB_NAME" || exit 1
 echo "UPGRADE: original database copied in ${COPY_DB_NAME}@${COPY_DB_NAME}."
 
 # Copy filestore