Add notes about storage redundancy

docs/roadmap/redundancy.md

@@ -17,4 +17,33 @@ data corruption
 
 ### Current State
 
-All primary data is stored
+All primary data is stored on a single 8TB drive array in hardware RAID 5. The
+array is comprised of four Western Digital Red NAS drives, each with a 3TB
+capacity. The array is fault tolerant, but not redundant. Secondary data is
+stored in one of three places: the primary array, a secondary drive array, or
+the 256GB boot drive of a single server.
+
+The secondary array is 470GB aggregate, comprised of four HST Travelstar 10K
+SAS drives, also in hardware RAID 5. The boot drive of the server is a consumer
+grade SSD. None of these systems are backed up or redundant.
+
+Primary data includes personal data including books, projects, documents,
+documentation, photos, etc. Secondary data is application configuration
+information and deployed hosting systems.
+
+In addition to the primary and secondary data, there is the tertiary data of
+a media collection (movies, TV, etc). Tertiary data is stored on the primary
+drive array, only because there is nowhere else with enough capacity to store
+it.
+
+### Desired State
+
+Data should be more efficiently segregated by priority tier. The two drive
+arrays should be split up into two arrays each: a pair of 3TB arrays using the
+WD Red's and a pair of 146GB array's using the Travelstars. Each pair of arrays
+should be installed into the two [Dell R410's](../hardware/poweredge-r410.md).
+Secondary data exists on the 146GB arrays on each server and is routinely
+backed up to the 3TB arrays on the same server.
+
+Primary data should be cloned on both of the 3TB arrays. Primary data should
+be backed up externally to a third server.