Log in with "Character A"
Make a change to... a power tray, i.e. move one ability to another spot.
Log off (to force the changes to be saved to the relevant NSA files)

Note which folder has the changed date/time stamp.
Make a new text file in that folder using the filename to keep details of your character (e.g. "0 - Aegis - Asphe Aria.Txt"

Meow a lot.

PS Last step is optional but recommended.