HT3275 Since updating OS to Mountain Lion from leopard, I get the following error message when trying to backup with time machine on external drive.  Could not complete backup to media share.  The network backup disk does not support the required AFP feat

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Since updating OS to Mountain Lion from leopard, I get the following error message when trying to backup with time machine on external drive.  "Could not complete backup to media share.  The network backup disk does not support the required AFP features."  What are AFP features and how do I get Time Machine to backup to my current external backup?
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This means that your NAS does not support the required encryption. Update your NAS to the latest firmware or ditch it and buy a Time Capsule (they are the most reliable when using TM).