Adding 2nd Drive...But before I do

I am new to this product, and have only used a NAS before as a user, at work, never deployed or owned one.
I have an EX4100 and 1x6TB disk. I have purchased a 2nd 6TB disk, and would like to insert it and create a raid 1 mirror.
2, related, questions.

  1. Is there any way of doing this without losing the data already on Disk 1, or do I have to back this up to a third device and redownload it later?
  2. I am currently using it as a plex server, so if I do have to format it, will I need to go through and install all the apps again? (That is, does the format reset it to factory settings?)

Thanks for any help you could give me.


Wrong subforum. See the dedicated EX series subforum where users more familiar with that device may be able to assist. This subforum (My Cloud) generally discusses the single bay/single drive My Cloud device.

OS3 firmware:
My Cloud Pro Series

OS5 Firmware:
My Cloud Pro Series