HPCCHT3-5144: Add note for upgrade path.

It would be convenient for admins if they knew to look at the previous sdu.conf.

Signed-off-by: Nathan Zimmer <[email protected]>

operations/iuf/workflows/configuration.md

@@ -105,6 +105,7 @@ required for initial installation scenarios.
     - Enable previous CPE versions or alternate 3rd party products (optional, done for each product release)
 - SDU
     - Configure SDU via `sdu setup`
+    - If this an upgrade you can refer to or copy in the stored the backup you created in the [Preparation](preparation.md#3-save-system-state-before-upgrade) step.
 - SAT
     - Configure SAT authentication via `sat auth`
     - Generate SAT S3 credentials