Update source/administration/backups.txt

used to instead of too

Author: aaronott

source/administration/backups.txt

@@ -149,7 +149,7 @@ Snapshots have the following limitations:
   files, journal (if applicable), and configuration on one logical
   disk that doesn't contain any other data.
 
-  Alternately, store all MongoDB data files on a dedicated device to
+  Alternately, store all MongoDB data files on a dedicated device too
   so that you can make backups without duplicating extraneous data.
 
 - Ensure that you copy data from snapshots and onto other systems to