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The one good point about the eReader format is that it's not locked into a device. As long as you can load the eReader software onto a device you can read any of the DRMed eReader format books. The key is the last eight digits of the credit card you registered at the site. It doesn't even have to be the card with which you purchased the books. As long as you keep a backup of the file and know the card number you'll be able to read that file.
With MobiPocket and Adobe DRM schemes the files are encoded for a particular device or sets of devices. If you no longer have that device then you cannot read that file. Vendors usually allow you to register three or four devices with MobiPocket and as long as the vendor is in business you can keep changing the devices. But if the vendor shuts down the server (for whatever reason) you are locked into the devices that are already registered. So your backups will continue to work on your registered devices. You get a new PC, PDA, ebook reader, or cell phone and that requires you to register its unique PID in order to get a file that you can read. If the vendor's DRM server is no longer up then you can't register your device. Your options are to either repurchase the ebook at a different vendor or remove the DRM.
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