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Oct 28, 2014 12:36 PM in response to aprendreby Kappy,Update to Yosemite:
Upgrading to Yosemite
You can upgrade to Yosemite from Lion or directly from Snow Leopard. Yosemite can be downloaded from the Mac App Store for FREE.
Upgrading to Yosemite
To upgrade to Yosemite you must have Snow Leopard 10.6.8 or Lion installed. Download Yosemite from the App Store. Sign in using your Apple ID. Yosemite is free. The file is quite large, over 5 GBs, so allow some time to download. It would be preferable to use Ethernet because it is nearly four times faster than wireless.
OS X Mavericks/Yosemite - System Requirements
Macs that can be upgraded to OS X Yosemite
1. iMac (Mid 2007 or newer) - Model Identifier 7,1 or later
2. MacBook (Late 2008 Aluminum, or Early 2009 or newer) - Model Identifier 5,1 or later
3. MacBook Pro (Mid/Late 2007 or newer) - Model Identifier 3,1 or later
4. MacBook Air (Late 2008 or newer) - Model Identifier 2,1 or later
5. Mac mini (Early 2009 or newer) - Model Identifier 3,1 or later
6. Mac Pro (Early 2008 or newer) - Model Identifier 3,1 or later
7. Xserve (Early 2009) - Model Identifier 3,1 or later
To find the model identifier open System Profiler in the Utilities folder. It's displayed in the panel on the right.
Are my applications compatible?
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Oct 28, 2014 12:46 PM in response to Kappyby aprendre,Thanks for your reply.
In fact I already knew I can upgrade to Yosemite for free, but I don't have too much space on my hard disk and I suspect that Yosemite will take quite a bit of it. Do you know how much?
I was trying to find out whether I could go on with my Lion with a minor upgrade or something like that. Is Yosemite the only way to keep on with my box sync? Is there any other options in terms of space on disk savings?
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Oct 28, 2014 12:51 PM in response to aprendreby Allan Eckert,If your free disk space on your hard drive is low enough for you to worried about upgrading OS X then it is for sure way too low to run OS X safely.
The first thing you should do is backup all of your data.
Then you should either move to another drive or delete enough of your files from your Home directory to clear off 15 GB at least, 20 GB would be better.
Only then should you even think about upgrading OS X.