diff --git a/Filer.md b/Filer.md
index db6deb0..2cd20b8 100644
--- a/Filer.md
+++ b/Filer.md
@@ -1,3 +1,13 @@
 This page aims to consolidate the pages on the [[single-node filer|Directories and Files]] and [[distributed filer]] into one.
 
-SeaweedFS comes with a lightweight "filer" server, which provides a RESTful wrapper around SeaweedFS's arbitrary blob API, mapping content to a traditional file directory of paths.
\ No newline at end of file
+## Background
+
+SeaweedFS comes with a lightweight "filer" server, which provides a RESTful wrapper around SeaweedFS's arbitrary blob API, mapping content to a traditional file directory of paths.
+
+## Backends
+
+SeaweedFS's built-in filer supports three different backends (although pull requests to add more are always welcome).
+
+The default backend, LevelDB, is for simple, non-distributed single nodes.
+
+The other backends, Redis and Cassandra, are for clustering backing stores that can be distributed across several nodes at high scale.