How to backup a database in noarchivelog

My database is in NOARCHIVELOG.
I can open rman
which command can i use to backup my database in this mode.
is there anything i need to configure before it backups in this mode.

why you dont need to turn on the archivelog?
CONFIGURE RETENTION POLICY TO REDUNDANCY 1
how many days back you are responsible to revert back the database?Someday It may be asked to you restore the some days before dataabase backup, before that raising the question ,raise the question to mangment personnel how many days back will i be responsible to restore the database,if they give you 7 days then make sure yours disk space can accomodate 7 days backup if not then ask them to arrange space for disk if they give alternate tape cartrdige then tell them that x hours will take to restore the database in disaster recovery scenario cause tape cartridge data restoration takes time.
No archive mode is yours decision then before doing it aware managment personnel that i can only restored the last good backup data,good backup does not mean last backup,last backup may be corrupt ,last good backup is the backup which you can restore then you will be able to restore only till last good backup,with archived enabled you will have chance to recover till before crash but with no archivelog there is only one option recovery till last good backup.
Khurram

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