This publication from IBM on how to save HMC critical data gives more information.
Dig Deeper on Storage
Related Q&A from Ken Graap
Find out if log files can be omitted during a save without causing problems in a full restore. Continue Reading
The BRMS Network feature allows a BRMS system to connect to other BRMS systems via a network, and enables a user to consolidate media such as backup ... Continue Reading
The only option to correct damage preventing file journaling is to use the RCLSTG command. Continue Reading