Once the download was completed the installation of the upgrade can be started from the Download folder. In total, the upgrade to Yosemite is worth 5.16 GB of data. It took more than three hours to download which is most likely caused by my very slow connection to the internet at home. Whenever you click on that button the download starts. When you open the AppStore there is a big banner with the Yosemite Logo and a small Update button. The upgrade process is started from the AppStore. Last weekend I decided to upgrade Mac Os X on my Mac Book to version 10.10 aka Yosemite. All one has to do is connect an external hard-drive and start a backup using Time Machine by clicking on the following icon. Mac Os X has a backup utility called TimeMachine which comes for free with the system. Prerequisiteīefore one upgrades a whole operating system, a complete backup of user data is an absolute must. Although one has to admit that all the points mentioned here against the upgrade are nowhere near the nightmare of an upgrade from Windows 7 to 8. Unlike with the previous upgrade to Mac Os X 10.9, no real performance boost is perceived when upgading to Yosemite. Also for production systems, an upgrade is probably still a bit early. All those who want to stay on the safe side and hate to work around issues and new features, are best advised to wait with an upgrade to Yosemite.
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