I can understand having those backup and restore partitions on a regular drive, because most failures on a regular drive will leave most of the drive readable,

I can understand having those backup and restore partitions on a regular drive, because most failures on a regular drive will leave most of the drive readable, even if you have to boot from some other media. But for SSDs, failures tend to be catastrophic, don't they? I would expect the entire drive to be unreadable if anything goes wrong. If this is just for recovering from OS failures rather than hardware failures, I'd much rather have a DVD. It's a lot cheaper than space on the SSD.