How to backup some datafiles, not a full set.

Dear all,
I have a full set of data in "/u01/oracle/uatdata", however I don't have enough space in UAT. So that I just want to backup some data files in order to testing my hot backup scripts. How can I do that?
Best Regards,
Amy

If I only backup some of the data files in the weekly & daily backup, can I still perform recovery by using the following scripts:
Run
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 7 DAYS;
allocate channel ch1 type disk format '/u02/db/BACKUP/RMAN/backup_%d_%t_%s_%p_%U.bck';
backup incremental level 1 cumulative database plus archivelog delete all input;
delete noprompt obsolete;
delete noprompt archivelog all backed up 2 times to disk;
backup current controlfile;
backup spfile;
release channel ch1;
Any modifications need?
Please advice,
Amy

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