diff --git a/backend/Dockerfile b/backend/Dockerfile
index 928adcd1f7..397a0ba03d 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -117,8 +117,10 @@ WORKDIR /dist
 ENV GEONATURE_STATIC_PATH=/dist/static/
 COPY /backend/static/ ./static/
 COPY --from=node /dist/node_modules/ ./static/node_modules/
+ENV GEONATURE_CUSTOM_STATIC_PATH=/dist/custom/
+RUN mkdir custom
 ENV GEONATURE_MEDIA_PATH=/dist/media/
-COPY /backend/media/ ./media/
+RUN mkdir -p media/attachments
 
 WORKDIR /dist/geonature
 
diff --git a/backend/geonature/app.py b/backend/geonature/app.py
index 7d2fbd413d..57d6699550 100755
--- a/backend/geonature/app.py
+++ b/backend/geonature/app.py
@@ -13,6 +13,7 @@
 from flask_cors import CORS
 from flask_sqlalchemy import before_models_committed
 from werkzeug.middleware.proxy_fix import ProxyFix
+from werkzeug.middleware.shared_data import SharedDataMiddleware
 from psycopg2.errors import UndefinedTable
 from sqlalchemy.exc import OperationalError, ProgrammingError
 from sqlalchemy.orm.exc import NoResultFound
@@ -96,6 +97,14 @@ def create_app(with_external_mods=True):
     app.wsgi_app = ProxyFix(app.wsgi_app, x_host=1)
     app.wsgi_app = RequestID(app.wsgi_app)
 
+    if config.get("CUSTOM_STATIC_FOLDER"):
+        app.wsgi_app = SharedDataMiddleware(
+            app.wsgi_app,
+            {
+                "/static": config["CUSTOM_STATIC_FOLDER"],
+            },
+        )
+
     app.json = MyJSONProvider(app)
 
     # set logging config
diff --git a/backend/geonature/utils/config_schema.py b/backend/geonature/utils/config_schema.py
index b513449f38..6c116b90d2 100644
--- a/backend/geonature/utils/config_schema.py
+++ b/backend/geonature/utils/config_schema.py
@@ -20,7 +20,7 @@
     DEFAULT_LIST_COLUMN,
     DEFAULT_COLUMNS_API_SYNTHESE,
 )
-from geonature.utils.env import GEONATURE_VERSION, BACKEND_DIR
+from geonature.utils.env import GEONATURE_VERSION, BACKEND_DIR, ROOT_DIR
 from geonature.utils.module import get_module_config
 from geonature.utils.utilsmails import clean_recipients
 from geonature.utils.utilstoml import load_and_validate_toml
@@ -198,6 +198,7 @@ class GnPySchemaConf(Schema):
     SENTRY_DSN = fields.String()
     ROOT_PATH = fields.String(load_default=BACKEND_DIR)
     STATIC_FOLDER = fields.String(load_default="static")
+    CUSTOM_STATIC_FOLDER = fields.String(load_default=ROOT_DIR / "custom")
     MEDIA_FOLDER = fields.String(load_default="media")
     CAS = fields.Nested(CasSchemaConf, load_default=CasSchemaConf().load({}))
     MAIL_ON_ERROR = fields.Boolean(load_default=False)
@@ -217,6 +218,10 @@ class GnPySchemaConf(Schema):
     @post_load()
     def folders(self, data, **kwargs):
         data["STATIC_FOLDER"] = os.path.join(data["ROOT_PATH"], data["STATIC_FOLDER"])
+        if "CUSTOM_STATIC_FOLDER" in data:
+            data["CUSTOM_STATIC_FOLDER"] = os.path.join(
+                data["ROOT_PATH"], data["CUSTOM_STATIC_FOLDER"]
+            )
         data["MEDIA_FOLDER"] = os.path.join(data["ROOT_PATH"], data["MEDIA_FOLDER"])
         return data
 
diff --git a/custom/.gitkeep b/custom/.gitkeep
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/install/migration/migration.sh b/install/migration/migration.sh
index 64403aa6bb..1f4d835628 100755
--- a/install/migration/migration.sh
+++ b/install/migration/migration.sh
@@ -30,6 +30,11 @@ echo "Copie des fichiers de configuration…"
 # Copy all config files (installation, GeoNature, modules)
 cp ${previousdir}/config/*.{ini,toml} config/
 
+if [ -d "${previousdir}/custm" ]; do
+    echo "Copie de la customisation…"
+    cp ${previousdir}/custom/* custom/
+done
+
 echo "Vérification de la robustesse de la SECRET_KEY…"
 sk_len=$(grep -E '^SECRET_KEY' config/geonature_config.toml | tail -n 1 | sed 's/SECRET_KEY = ['\''"]\(.*\)['\''"]/\1/' | wc -c)
 if [ $sk_len -lt 20 ]; then