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Any service that does have a "backup" or multiple device option tends to limit it to their own service or devices... backup on THEIR servers, usage with THEIR software... like the Kindle, Kindle for PC, Kindle for Mac, for iPad, backup using their service. Many of them use Proprietary formats specifically to enforce this "company device/software or nothing" outlook.
Granted as most services handle music now is MUCH less restrictive, it started at #3 and most services now have it some sort of variant from #2. I suspect that ebooks will go the same way as most digital media does.
As a long time computer tech, MOST software licenses allow for ONE installation, on one computer, unless it is specifically a multi-license purchase. Look closely, the wording typically states that it can be transferred from one computer to another if the first one either has it removed/uninstalled, or that computer is no longer functional. Some people misinterpret that as allowing for two installations at a time.
This is why it always helps to read the End User Agreement before attempting to backup, change, or install it on another PC.
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