2-Phase commit or replication?

Dear all, my company is running a 40-50 Gigabyte database using Oracle 7. We're planning to set up a secondary site as the backup of our business database. Could you all experts give me a clue what's the best solution to implement this? I mean what's the pros and cons to use 2PC or replication? Is 2PC a high performance penalty option? Would appreciate if you can share with me your experience. Many thanks in advance.

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