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B&N run their own servers as they outright own the DRM-scheme they use.
Adobe also run their own servers, but seem to license out the tech to other people to run compatible servers to handle their own downloads (Kobo, Overdrive). Though maybe it all just gets routed to a central Adobe server under different domain names.
As far as B&N/ADE-DRM books go, the twain shall never meet and one going down shouldn't affect the other.
The problem will be when the provider of whichever flavour of DRM you use no longer supports it.
It used to be that the B&N-DRM (which started out as the eReader-DRM which they bought) was pretty robust in this regard and you could just keep using your files regardless, but now B&N seems to have been trying to lock people in more to their apps by requiring login info before the apps will work (as far as mobile apps go; the actual devices and PC/Mac apps don't yet have these new restrictions, I think).
However, unless they do something to change the actual encryption of the files, they'll still respond very well to stripping without any extra tools beyond Python and work perfectly well with older versions of apps, even if the future ones balk at opening them. And of course any previously downloaded files can be easily stripped with the old tools even if they change something in the new downloads.
As for ADE, Adobe actually used to have an older style of DRM which they changed at some point. People who didn't switch over their old files to the new version in time lost all access and could no longer open their old files, even on properly registered devices.
This is a bit of a tricky point, because liberating Adobe stuff requires getting info from properly registered software to use on a file compatible with it.
I think the moral of this story is strip early, strip often. No matter where your books are coming from and how "safe" you think they are. Because you just never know.
Hope this helps.
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