I have paid and downloaded LION and want to update my IMAC, can i just run install and it keep photos settings etc from Snow Leopard or is a full reinstall with wiped hard drive, anyone have any experience of this and do i need to run a backup beforehand?

I have paid and downloaded LION and want to update my IMAC, can i just run install and it keep photos settings etc from Snow Leopard or is a full reinstall with wiped hard drive, anyone have any experience of this and do i need to run a backup beforehand?

Always backup your important data before upgrading to a new Mac OS X.
Lion doesn't erase the drive but better to be safe than sorry.
And run Disk Utility  (Applications/Utilities). Verify and if necessary repair the startup disk before upgrading.
Using Disk Utility to verify or repair disks
Before upgrading read here >  Lion upgrade questions and answers:  Apple Support Communities
And here >  What applications are not compatible with Mac OS X 10.7 "Lion"? What upgrade or substitute options are available for common incompatible applications? @ EveryMac.com

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