How can i safely back up my iphone before upgrading iOs?

needtoknow

New member
I have authorised my computer. I have opened itunes. I have selected devices and right clicked to back up my iphone. However i can not see the back up copy anywhere. am i supposed to?
I have selected' transfer purchases from my iphone' (file menu) and 'transfer purchases' from right clicking on the device.
some/or most of my apps appear to have transferred onto the itunes when i selected 'transfer purchases from iphone. Is this also a back up or something different and will they transfer back to my iphone once ive upgraded it?
If i highlight apps on the itunes menu it shows the ones i have. what will happen if i sync apps?

Just want to make sure im all backed up!
 
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