Before embarking on a major OS upgrade, it would be wise, advisable and very prudent if you backup your current system to an external connected and Mac formatted Flash drive OR externally connected USB, Thunderbolt or FireWire 800, Mac formatted hard drive. Then, use either OS X Time Machine app to backup your entire system to the external drive OR purchase, install and use a data cloning app, like CarbonCopyCloner or SuperDuper, to make an exact and bootable copy (clone) of your entire Mac's internal hard drive.
This step is really needed in case something goes wrong with the install of the new OS or you simply do not like the new OS, you have a very easy way/procedure to return your Mac to its former working state. Then, determine if your Mac meets ALL minimum system install requirements. OS X Lion system requirements Purchased emailed download code here. To use Lion, make sure your computer has the following: An Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon processor Mac OS X v10.6.6 or later to install via the Mac App Store (v10.6.8 recommended) 7 GB of available disk space 2 GB of RAM To install OS X 10.8 Mountain Lion, 10.9 Mavericks (currently unavailable) or OS X 10.10 Yosemite.you need one of these Macs: OS X 10.8 Mountain Lion purchased emailed download code here.
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I have a question related to the first one. I read in a previous thread that someone installed Yosemite and it copied her IPhoto pics but not their organization (in their case, by date), leaving a huge mess. If one had a good backup, which I think I do (Time Machine on an external drive), could one just re-install the backed-up I Photo library, but not everything else? Also, I've looked but haven't ever found any kind of handbook or guide for using Time Machine. How does one learn about it? I just poke randomly at buttons and figure out the obvious stuff, every time I need something. You are incorrect in your information.
It is the NEW Photos app that destroys some of the iPhoto library data when converting the library to be compatible with the new Photos app. If you previously downloaded the last iPhoto update (which is no longer available from the Mac App Store), then iPhoto continues to work with Yosemite and you can choose to continue to use iPhoto instead of the new Photos app. If you don't have the last update of iPhoto, any other version of iPhoto will no longer work with Yosemite. My advice would be to keep the current OS X version and iPhoto version you are using. Free quicktime for mac 2018 h. Make a duplicate version of your current iPhoto library as you will have another duplicate folder to use with the new Photos app in Yosemite and you won,t destroy the library you are currently using with iPhoto. Your only other option would be to install either Yosemite to another location like another external hard drive OR clone (copy) your entire, current system and data to another external hard drive using my previously mention techniques using my stated options for data cloning software.