diff --git a/plugins/emqplus_backend_cassa b/plugins/emqplus_backend_cassa
new file mode 160000
index 000000000..62c52536a
--- /dev/null
+++ b/plugins/emqplus_backend_cassa
@@ -0,0 +1 @@
+Subproject commit 62c52536a4263fa2735478420b8e78b8f494be2a
diff --git a/plugins/emqplus_backend_mongo b/plugins/emqplus_backend_mongo
new file mode 160000
index 000000000..8a7b5cc03
--- /dev/null
+++ b/plugins/emqplus_backend_mongo
@@ -0,0 +1 @@
+Subproject commit 8a7b5cc03f1e55cfd6d50ed1a7161ecd8a4a14be
diff --git a/plugins/emqplus_backend_mysql b/plugins/emqplus_backend_mysql
new file mode 160000
index 000000000..c7bebfe62
--- /dev/null
+++ b/plugins/emqplus_backend_mysql
@@ -0,0 +1 @@
+Subproject commit c7bebfe62a208284cb38cab89f2fd6d73968aa33
diff --git a/plugins/emqplus_backend_pgsql b/plugins/emqplus_backend_pgsql
new file mode 160000
index 000000000..92825dea5
--- /dev/null
+++ b/plugins/emqplus_backend_pgsql
@@ -0,0 +1 @@
+Subproject commit 92825dea51e3debf68a2387e66bae27d375975f8
diff --git a/plugins/emqplus_backend_redis b/plugins/emqplus_backend_redis
new file mode 160000
index 000000000..4e9c1a234
--- /dev/null
+++ b/plugins/emqplus_backend_redis
@@ -0,0 +1 @@
+Subproject commit 4e9c1a234d35561c6227f0e6ff98a612fab50ec4