Here are few suggestions that I would like to contribut towards your script.

1. Make sure that you have enough disk space.

2. In the backupscript, include the option of deleting the archivelog files as they get backed up.
Code:
backup archivelog all
delete input;
3. Mention files per set option to the backup, such that your recovery would get speeded up

4. IF your database is of Enterprise, then you might want to think of adding more channels. On the other hand if it were to be of standard edition, then you can use only one channel at a time.

5. One other thing is that you can put them all in a script and then
call those scripts as

Code:
    run { execute script script_name; }
6. Then the last but not the least, try a recovery and get your self accustomed to it with a recovery

7. Make sure that you periodically clean the backup both from the catelog and disk, based on your shop's backup policy.

Sam