RMAN delete BEFORE backup

Using Oracle 9i RMAN template below. Level 0 executes on Sunday, Level 1 the rest of the week.

Client has limited disk space. Can the 'delete input' and/or 'delete obsolete' be executed BEFORE the two 'backup' commands?

Are there other tweaks that can be applied? Got a better script?

run {
allocate channel Channel1 type disk format 'F:\orabackups\%d_%s_%p_%t'; backup incremental level 1

    ( database include current controlfile ); backup ( archivelog all delete input ); }
allocate channel for maintenance device type disk; delete obsolete device type disk;

Cheers,

Alan Sterger

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