Upgrading to mountain lion will it erase my calendars on my devices?

I have not upgraded to Mountain Lion yet but am ready to do so & am currently running Snow Leopard 10.6.8.  I don't use my Calendars on my iMac since I don't have icloud and am nervous that once I install Mountain Lion it will then erase all the calendars I have set up on my ipads and iphones to match the iMac.  Can anyone tell me the best way to upgrade and not lose the Calendar info I have on all my devices?  Thank you!!

These will protect you Mac. I have no iOS devices, so can't discuss those things.
http://www.macmaps.com/upgradefaq.html
http://www.macmaps.com/backup.html
http://www.thexlab.com/faqs/installswupdates.html
http://www.thexlab.com/faqs/backuprecovery.html

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