Add fsdr backup on fsdrnas

doc/fsdrnas.yml

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+# fsdrnas
+## Enable SSH and prohibit-password
+```shell
+xbps-install -Su
+vim /etc/ssh/sshd_config
+ln -s /etc/sv/sshd/ /var/service/
+```
+# Create RAID
+```shell
+xbps-install mdadm
+mdadm --create --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sda2 /dev/sdb2
+mkfs.btrfs -f /dev/md0
+cat /proc/mdstat
+```
+## Check disks
+```shell
+xbps-install smartmontools
+smartctl -a /dev/sda
+smartctl -a /dev/sdb
+```