what step should we follow to backup the oracle 9i database to get full recovery?

we have oracle 9i database but after crash down of server we are unable to get full recovery of database. will you pls advice us what is the best practice we follow to backing up our oracle 9i database so in near future if same problem persist we can able to get full recovery of database.
dear sir
we have only one real time server which we are using for backing up our oracle database.we do not have any specific back up server. so what type of good back up practice we follow which will able to give full recovery.awating for your reply.

Let me know what happen with your Backup server if you have one,
Its a good practice having a backup server and a real time server, if any thing happen with real time server you can recover the data from the backup server and continue with the work. check the following link to know about the backup and recovery principles http://download.oracle.com/docs/cd/B10501_01/server.920/a96519/toc.htm

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Guru says:

Let me know what happen with your Backup server if you have one,
Its a good practice having a backup server and a real time server, if any thing happen with real time server you can recover the data from the backup server and continue with the work. check the following link to know about the backup and recovery principles http://download.oracle.com/docs/cd/B10501_01/server.920/a96519/toc.htm
References :
http://download.oracle.com/docs/cd/B10501_01/server.920/a96519/toc.htm