The Wikipedia page for OS X Yosemite indicates the systems need approximately the same amount of free space:Īll Macintosh products capable of running OS X Mavericks are supported by Yosemite as with Mavericks, 2 GB of RAM, 8 GB of available storage, and OS X 10.6.8 (Snow Leopard) or later are required. OS X Mountain Lion, Lion, or Snow Leopard v10.6.8 already installed.It could be that as part of the upgrade process, backups prepared on the previous OS version are pruned.Īpple's KB on the minimum requirements for OS X Mavericks states: ![]() ![]() Could it be that installing Yosemite "purged" backups prepared when you were still on Mavericks? It did that with my machine at least.
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