Is it possible to set up a backup between two external drives

Is it possible to set up a backup between two external drives?
i use time machine to back up my imac onto an external 2T.
i also have two external 3T drives.  i am looking for redundancy of data, tried software RAID and it failed.  i also see some limitations with RAID that a backup would avoid.
thanks for sharing your expertise.
be well,

so thanks to all of you, particularly rkaufmann87 i have decided to stop the plan of setting up a software RAID set.  instead i have downloaded ccc and am in the process of setting up the secone 3t external drive as a clone.  i will use time machine to back up the internal hard drive only and if possible see if i can clone that as well onto one of the 3t's.
this gives me the peace of mind i sounght and avoids the problem of total corruption that exists with the raid solution i was exploring.
thank you all for making this an enjoyable and informative experience.  what a powerful community.
be well

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