Oracle 11g XE - Backup

Can someone tell me what is the the difference between 'Take a full database backup vs Backup database'? I performed a backup a couple of days ago, but I need to simulate a database failure and prior to doing so, I need to backup the database so that I can see the changes.
Thank you.

Pl post OS details and a link to the document you are following. Most likely there is no difference between the two
HTH
Srini

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