When it comes to updating to major versions of operating system there are a few things one should have in mind before performing the update. Below are a few things you should know in order to successfully update to OS X Mountain Lion.
- Mac model - check if your Mac is compatible with OS X Mountain Lion, otherwise if the model is not, you won't be able to download it.
- Snow Leopard - this is the minimum requirement in terms of OS X in order to download and install Mountain Lion. Be sure to have the latest update (10.6.8) install. No need to update to Lion (10.7).
- Check apps - check if the apps you depend the most everyday, like for work or school, support Mountain Lion.
- Backup - create a backup on an external hard drive and make sure more than once that you have backup all your content. You can use Time Machine for this.
- Download OS X Mountain Lion - if your Mac is supported, then you will be able to download it from the Mac App Store for $19.99
- Create USB drive - very handy to create a USB bootable key of OS X Mountain Lion
- Clean install if possible - I recommend doing a clean install which erases all the hard drive contents and installs Mountain Lion. Be sure to backup first.