Buffalo TeraStation 5010 TS5210DN User Manual page 53

1
In Settings, click Storage.
2
Click to the right of "RAID".
3
Choose a RAID array.
4
Set the RAID mode to "RAID 1".
5
Select the "Add a drive to a RAID array with RMM. Your data will be preserved." checkbox.
6
Select the drive whose data will be saved from the drop-down list.
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