I hate to be a Debbie Downer on this one, but AIX backup/restore will be very tricky for anyone to implement, as the format itself is tied to the closed-source AIX version of JFS.
There is a copy of the program's code floating around of questionable origin as a reference, and this too
http://www.theweeks.org/xcssa/files/sys-admin_V8/html/v04/i04/a5.htm