If you plan on using ANSYS command files, then you need only store
your command file and/or the log file.
This file contains a complete listing of the ANSYS commands used to get
you model to its current point.
That file may be rerun as is, or edited and rerun as desired
(Command File Creation and Execution).
If you plan to use the command mode of operation, starting with an existing log file,
rename it first so that it does not get over-written or added to, from another ANSYS run.