Okay. The point remains the same. EIDE is not compatible with AT and SATA is not compatible with EIDE. And the point was, even though the data may remain viable, if you can't access that because the interface is no longer available, the data is worthless.
As far as long transition periods allowing for backwards support, that's not the point. Many new motherboards today have no EIDE drive interfaces and certainly don't have AT. Yes, there are still adapters available but they are thinning out too.
I used to use Adaptec tapes to back up my drives. One installed in a 5.25 drive bay and used the AT interface. Another tape drive used the now obsolete parallel port. Other obsolete or near obsolete commonly used media for backups were 5.25 floppies, 3.5" floppys, and CDs. DVDs are pretty much history too.
People have precious memories on VCR tape but VCR players are pretty scarce.
I am not a fan of storing my data in "the cloud" but that may be the only real permanent solution because access to that data will evolve and maintain compatibility - unlike access though obsolete hardware we have locally.
FTR, It is not that I dislike the cloud out of fear my data will get lost. I am certain there are already more copies than anyone knows. My fear is those responsible for keeping it secure and out of the hands of the bad guys are incompetent and will negligently allow our data to be hacked and stolen.