HT1222: Apple security updatesLearn about Apple security updates
Currently Being ModeratedJan 30, 2014 1:35 PM (in response to aziz96)
Normally they do not -- but I assume that my photos and contacts can disappear at any time for any reason and act accordingly even when not doing an update. This and other forums have hundreds of posts of lost pictures and lost contacts caused by all sorts of situations and issues.
In addition to backing up to iCloud or via iTunes, I would recommend that you import the pictures to your computer if you have one: http://support.apple.com/kb/HT4083 and that you sync your contacts http://support.apple.com/kb/HT1296