A mirrored RAID (known as RAID 1) contains ... I’d go one of two ways. The first is to leave the drives right where they are and use them as part of a redundant Time Machine backup.

External drive backup has been the ... that gives up the RAID capabilities, see the Synology 1-Bay NAS Server. For $149, you get all of the features of the 2-bay system except for the data redundancy.

Though it’s a bit pricey, the TD2 is indeed the fastest external two-bay ... RAID 1, or use two of them so you have a backup. Performance in RAID 1 will be about that of a single external drive ...