docs: mention your own storage in migration

docs/source/migration/migration-to-docker.rst

@@ -178,7 +178,13 b' This will restore the previously stored DB dump into new dockerized DB.'
 7. move data into docker storage
 ++++++++++++++++++++++++++++++++
 
-Step one is to move the required components to the :file:`.custom/storage` directory inside the docker
+.. note::
+
+    We recommend using docker volumes, however if users would like to keep their existing path on the host machine
+    it's possible to simply mount the existing structure to the docker one. Please check :ref:`enable-host-volumes`
+    The next steps can be omitted in case of using your own filesystem to store data.
+
+This step is to move the required components to the :file:`.custom/storage` directory inside the docker
 compose stack. This directory is mounted later on so data can be copied over into docker storage engine volumes.
 
 .. note::