There are many ways in which you can keep the systems in sync
1 Using Rsync Copy from one system to the other directly
This also alows cloning of directories , exports and datafiles as required
2 Backup and restore using backup tools like Netback ( network backup )
3 Depending on your databse you can migrate date using tools that come with your databse ( datagard etc... )
4 Export and import data via network
4 Tape dirves can be made avable on both system via san and then using san backup tools or even ( tapeutil )
5 GPFS
6 then Depending on your storage you may be able to use storage mirror of some sort ( metromirror , flashcopy etc..)
Hope this helps
