I had one of those. Worked great until Seagate pushed out a software upgrade that killed both 500 GB drives. Since they were mirrored everything was lost.
That also wont protect you against a fire.
Go Western Digital, Seagate sucks. As for a fire, copy the data to a DVD or other hard drive once a year and store it offsite.
I don’t like the idea of my data being stored in some cloud by someone else...