That said, I thought at least in the US you was allowed to make you legal data backup of any media you physically owned?
Lots of people think that, but the text of the DMCA makes it very clear they are mistaken. There have been a few holes poked in the DMCA over the years, but anything copy-protected cannot, by law, be circumvented for any reason whatsoever: not for backup, not for academic use, not for commentary, nor any other reason.
This is of course ridiculous, and until the Conservatives got into power Canada was in most areas much more sensible about the concept of personal use. Thanks, Harper ...
I can't comment on the UK laws because I haven't seen them, but this sort of thing generally backfires eventually, either by creating a market for pirated stuff or methods to circumvent the DRM/copy protection, or by consumers eventually bringing pressure to bear when the silliness of it eventually finds a case that embodies it ("Mom sentenced to 99 years for copying Scooby-Doo DVDs so her kids wouldn't keep destroying the paid-for originals," et al).