CommentStreams:D0aca3b33770b9117fb811fa363cd611

Is it possible to set up a Raid1 with a single-disk storage pool, and then later on add the second HDD? I bought an 8TB HDD, and I was initially planning to buy another before new year due to budget constrains. I'd like to use and I don't want to loose data in the process. If it's possible, can you please explain how to do it? thanks