As zaxxon asked previously.
Where is data stored?
How do you want (or can) move data elsewhere?

You can
> cp /ora/8i/data/*.db /backup/ora/8i/data

or you can do some kind of find command
> find blah-blah -exec some-special-commands

Without specifics, it can be hard for anyone here to understand what you need. This is especialy so for those of us without an Oracle system and thus the knowledge of how that data is stored.

So, the more details, the better.