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"Mikael" == Mikael Abrahamsson [off-list ref] writes:

Mikael> On Wed, 11 Oct 2017, Joseba Ibarra wrote:

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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.

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

Mikael> What does /etc/fstab contain regarding md0?

Did you have the RAID5 setup as a PV inside a VG?  What does:

    vgscan

give you back when you run it as root?