Honestly, the very best way is FireWire, since that lets you capture the data off the tape bit-for-bit, which not only preserves quality, but also may use less space.
Standard Definition (ie 625/50 or 525/60) consumer DV that comes out on a Firewire port is close to 25Mbit/s net. (Only difference between miniDV and DV is the physical size of the cassette.)
More, including info on professional versions, at https://en.wikipedia.org/wiki/DV_(video_format)
Indeed! (I know. I used to be a professional Mac consultant in DV’s heyday and supported a number of video editors.
I also took some video production classes in college, in which we used DVCPRO cameras — Panasonic’s pro version of DV. I still have a DVCPRO tape in my junk somewhere!)
Anyhow, what I was thinking when I wrote is that the DV stream may use less space than doing an HDMI capture. (Depends on the codec and resolution used of course.)
But above all, copying the DV stream to disk is ideal since it doesn’t involve transcoding, especially not a lossy format like h.264. For archival purposes, storing the source data is ideal. And of course DV was designed for editing, unlike codecs that use interframe compression (like h.264 and all the codecs used for streaming).