Dave Nanian is, indeed, excellent. As I recall, the major difference between the free and paid versions is that the paid version allows "smart" (incremental) updates; the free version requires a complete clone, which takes significantly longer.
That sounds about right. But I always do a complete copy/clone for both of my Macs (2 copies each to two separate external SSDs).
Also, on that other site, with 50 ballots cast (no write ins or mailed in!), it's 50% for Time Machine, and 50% for SuperDuper! and Carbon Copy Cloner
combined.
