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Q: Upgrading from OS X Snow Leopard
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Apr 7, 2016 7:06 AMby Eric Root,Check to make sure your applications are compatible. PowerPC applications are no longer supported after 10.6.
Applications Compatibility (2)
El Capitan 10.11 Compatibility information
Do a backup before installing, preferable 2 backups on 2 different drives.
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Apr 7, 2016 8:18 AMby Lanny,HelpfulMacBooks, Early 2009, Mid 2009, and Late 2009 are all capable of running El Capitan.
Early & Mid 2009s can be upgraded to 6 Gigs of RAM and the Late 2009s can upgraded to 8 Gigs of RAM.
You should make a full backup to an external drive, before doing an upgrade, to prevent the loss of your data if there is a glitch, and because OS upgrades can't be literally uninstalled.
