Difference between redundancy & recovery window, rman

Hi All,
i want to know the difference between following two commands i.e.
1. configure retention policy to redundancy 1;
2. configure retention policy to recovery window of 1 days;
we are taking rman based FULL backup every night, so just want to keep one day old backup, would like to know which one of the above is more appropriate.
Regards,

Nayyares,
You should read this section of the docs,
http://download.oracle.com/docs/cd/B19306_01/backup.102/b14191/rcmconc1.htm#i1008093
Redundanc is nothing but the number of copies. So you decide that you want to keep all the time , 3 copies of the backup of your db, you are going to use this. This serves the purpose that you can use this backup for whatever period of time in the past. Any copies before than these mentioned copies, will be marked obsolete by oracle. So if the number is 2 and , for example, you took first backups with tags A, B. Now when you will take the next backup with TAG C , A will be marked as obsolete. The most recent number of copies are kept irrespective of the time.
Recovery window is that for how long , you want to go back in the past and be assured that the backup you have is sufficient for the recovery of db. This puts no limitations on the number of copies as like the Redundancy setting. So depending on your SLA, you may use the window timings.
Both the settings are mutually exclusive so you don't have the liberty to go for both of them. As per your requirement, recovery window should work.
As Sybrand mentioned, this all what I wrote is already in the docs(link mentioned by me above) so take some time and read it. Also, I would like to point you to this presentation which should make use of RMAN more clear.
http://blogs.oracle.com/alejandroVargas/gems/RmanHandsOn.pdf
HTH
Aman....

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