On Wed, 11 Oct 2017, Joseba Ibarra wrote:

Now I see the RAID, however can't be mounted. So, I'm not sure how to backup 
the data. Gparted shows the partition /dev/md0p1 with the used and free 
space.

Do you know what file system you had? Looks like next step is to try to 
run fsck -n (read-only) on md0 and/or md0p1.

What does /etc/fstab contain regarding md0?

-- 
Mikael Abrahamsson    email: swmike@swm.pp.se