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B&N is providing the DRM on their ePubs. Since it is password based (credit card name and number), the server going away isn't quite as much of an issue as for DRM where devices are registered. However, it can be difficult to remember CC#'s for expired credit cards and if B&N stopped selling ebooks new devices would likely not support it - so the DRM does age eventually.
Adobe has the right to use the identical DRM, and their mobile ADE software can read B&N ebooks (if you provide the CC info). However, most actual implementations of mobile ADE have chosen not to allow B&N ePubs. There are reports that Aldiko 2.0 for Android will be able to read B&N ePubs, and this may break the logjam. It is a shame that Bluefire (to pick on the best iPhone mobile ADE based app) does not support B&N ePubs, but their business model is based on getting money from independent ebookstores.
DRM isn't there for your benefit, and will always screw you if you give it long enough. So the only safe approach is to immediately strip DRM and then make backups of the DRM-free ebooks.
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