I have the following problem with my Synology disk station:
- I had one small HDD in Synology Diskstation, so I removed it.
- I bought 2 new HDD with the same capacity.
- I transferred backup from old disk to new and inserted this new disc into Synology.
- Synology works fine with one HDD but is not backed up, so I want to add a second HDD which should be used as mirror for HDD 1 (if one from discs will crash second will hold all data in copy, I just replace faulty HDD).
Problem is that I can choose between adding new volume or I can create disc group.
I don't know what is suitable for me, so I tried both solutions but without luck.
Could somebody tell me, what exactly should I do and what I should choose as backup for my needs?
NOTE: First disc is from 50 percent full of data, second disc is empty. I think that better is have copy 1:1 so second dis will be copy of the first disc.