How to backup and Restore in 8.1.7 Database

Hi,
I wanted to have complete backup and restore of 8.1.7 database. how can i achieve this. The steps in Oracle Management Server and scripts for the same.
Also, how can i backup and restore contents of an user of database which has tablespaces and sequences. Again i need the step in Oracle Management Server and scripts.
It will be more helpful if scripts are provided.
Thanks in advance.
Vikram

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