I agreed with this point of view, having my entire library searchable &amp; available while travelling was the selling point for me... until I received an email from Amazon saying my version of Kindle For Mac will stop working on September 15.  And I can&#x27;t run the new version, because the Macs I&#x27;m running Kindle on can&#x27;t be upgraded beyond Mac OS X 10.7.<p>I have plenty of other devices so I&#x27;m not (yet) locked out of my library, and those Macs can be converted to Windows 10 (which does run the latest Kindle software)... but it reminded me it isn&#x27;t a forever library.  I need to make non-DRM&#x27;d archive copies of all my digital books if I want to be able to use them for more than 4 to 5 years.