diff --git a/src/Applications/UI/Sources/State.elm b/src/Applications/UI/Sources/State.elm
index c27e17ca..f0beffe6 100644
--- a/src/Applications/UI/Sources/State.elm
+++ b/src/Applications/UI/Sources/State.elm
@@ -201,7 +201,20 @@ process model =
             Return.singleton model
 
         toProcess ->
-            processSpecific toProcess model
+            if model.isOnline then
+                processSpecific toProcess model
+
+            else
+                toProcess
+                    |> List.filter Sources.worksOffline
+                    |> (\s ->
+                            case s of
+                                [] ->
+                                    Return.singleton model
+
+                                _ ->
+                                    processSpecific s model
+                       )
 
 
 processSpecific : List Source -> Manager
diff --git a/src/Library/Sources.elm b/src/Library/Sources.elm
index 530df661..70517280 100644
--- a/src/Library/Sources.elm
+++ b/src/Library/Sources.elm
@@ -92,3 +92,34 @@ enabledSourceIds =
 setProperId : Int -> Time.Posix -> Source -> Source
 setProperId n time source =
     { source | id = String.fromInt (Time.posixToMillis time) ++ String.fromInt n }
+
+
+worksOffline : Source -> Bool
+worksOffline source =
+    case source.service of
+        AmazonS3 ->
+            False
+
+        AzureBlob ->
+            False
+
+        AzureFile ->
+            False
+
+        Btfs ->
+            True
+
+        Dropbox ->
+            False
+
+        Google ->
+            False
+
+        Ipfs ->
+            True
+
+        WebDav ->
+            source.data
+                |> Dict.get "url"
+                |> Maybe.map (\u -> String.contains "localhost" u || String.contains "127.0.0.1" u)
+                |> Maybe.withDefault False