Updated Cloud Cache Benefits (markdown)

Cloud-Cache-Benefits.md

@@ -84,7 +84,9 @@ SeaweedFS Cloud Cache has these unique characteristics:
     * Users can access data with FUSE mounted folders.
 ## Data Hoarding
   * Problem
-    * With cloud capacity and storage tiering, saving data files there may be a good idea. 
+    * Local storage is not reliable enough.
+    * With cloud capacity, reliability, and storage tiering, saving data files there may be a good idea. 
+    * Accessing cloud data is slow and costly.
     * Recently uploaded files very likely need to be accessed again.
   * With SeaweedFS Cloud Cache
     * Users can explicitly ask SeaweedFS Cloud Cache to uncache by file age.