Question:
What is the best method to backup the entire Client?
Answer:
The best way to backup the entire Client would be to use the DB Unload and select "Unload all objects".
For reference, here is documentation on the procedure - http://docs.automic.com/documentation/AE/10.0.3/english/AE_WEBHELP/help.htm#ucabke.htm%3FTocPath%3DAdministration%2520Guide%7CUtilities%7CAE%2520DB%2520Unload%7C_____1