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Hello Ahmad,
here is a link to an earlier post with a similar question: http://www.ariscommunity.com/comment/19696#comment-19696
After digesting those considerations you simply backup your databases in 7.2.4 (or higher) and restore them in the ARIS 9 environment. You need each database's system password for that.
Rehearse the migration in a test environment.
Regards, M. Zschuckelt
