RMAN deletes all conrtolfile autobackups
Hopefully this has been fixed in more recent versions but I had a very nasty experience with this on an 11gR2 training course, many moons ago.

&quot;... REDUNDANCY 1 ... &quot;

... tells Oracle to keep a single backup copy of each file.
It does not tell Oracle to keep a single, consistent (i.e. recoverable) set of backup files!
An entire class of trainees happily built shiny, new databases and then took a backup of them.
So far, so good.
Much later in the day, then got to the exercise of taking another backup, trashing their database and restoring it.
Problem was, the backup ran out of disk space part way through, leaving an inconsistent and unrecoverable set of files - a mish mash of the earlier backup and the new one.
&quot;REDUNDANCY 2&quot; would have prevented this, retaining the previous, recoverable set of backup pieces.
As would more disk space, obviously.
I'd recommend using a RECOVERY WINDOW instead.  It will fall more naturally in line with your [company's] Recovery Strategy.