About RAID 1 in hard disk drives

Some days ago I sent a photo about two disks but in this case they are not mirror because it was explained that for a mirror ,both physical drives would need to be a part of the same array,and the array would have to be setup as RAID 1 or RAID 1+0
In this case Do I need to create again the array to configure Raid 1??
If I do not make a backup about this logical drives, can I lost the saved information on this three logical drives of the first disk?
What do you advice to me?
I send the photo again,excuse me for the differents questions in a moment,thanks in advance