I can't find it - but I believe audio is held to the same standards as movies are for copyrights. Again, I'm looking for it - but I'm pretty certain you are allowed one backup copy.
Just use common sense - the laws were not made around what we think is right or should be allowed.
Some info I have found specifically addressing one backup copy
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http://www.videointerchange.com/audio_questions.htm
Copyright Law
The copyright laws as they pertain to this issue, state that a person who has purchased a musical recording, is allowed to make a single copy of the music they purchased on a different medium. For Example: you buy a CD, then make a tape copy of it to listen to in the car. That is perfectly legal. However. it would NOT be legal if you then sell or even give that tape to anyone else.
The copyright laws also allow a person to make a copy of the recording for safekeeping (or archiving). In other words, you are permitted to make ONE CD copy to serve as a backup in case the original master is destroyed.
Because of copyright issues we do not offer additional copies of our transfers or restorations - unless it is in the public domain, non-copyright or you are the copyright holder. The paperwork in trying to keep track of it all and checking for compliance is simply too great for the rates we charge. By placing an order for a transfer / restoration, you are by default, certifying that you are agreeing to and have met the above conditions.
Copyright Law alone, fills many pages of legislation..... Far more so than this brief discourse. Only a copyright lawyer who "eats, sleeps and breathes" copyright law can even begin to understand it. So convoluted and confusing are the laws that rarely will two separate courts themselves ever agree on an exact interpretation. That alone is another reason why that materials you submit for transfer, you by default certify you have the legal rights to make a copy....
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http://www.pcstats.com/articleview.cfm?articleid=868&page=3
Abstract: This article is a guideline on what you can and cannot do with your digital media under copyright. We wanted to dig a little deeper and clear up the somewhat grey area on backing up software and
music.
When can you backup legally?
Making multiple copies of the software - Copyright law in the United States and most other countries including Canada and the UK allows for a single 'archival' copy of any given commercial software to be made, for use only if the original fails. The wording may actually allow for two copies, but one of these is considered to be the 'copy' that is installed to the hard drive in order to use the program. Making any additional copies for personal use is a violation.