Especially for larger data, rsync seems to be the only reliable (and fast) way to do it. Drag & Drop, or cp and mv don't work as expected.
I have no problem with
cp and
mv, both work fine. But the best thing about
rsync is this:
--link-dest=DIR hardlink to files in DIR when unchanged
I have different backups from different dates, and it barely takes any additional disk space. It's very rare to need to find back an old file, but when I do, it's convenient to still have it.
In terms of storage type, what do you prefer?
Like I said: different ones from different brands. I expect some brands to be more reliable than others, and as I can't know which one is best up front, I get a new one once in a while.