Root How do you install custom roms?

[GTraymond]

I have a samsung galaxy ace rooted and with clockworkmod recovery can someone tell me what i can do to install custom rom on it and how do i get my original rom back if something goes wrong?

 

[lunatic59]

*moved to Ace - All Things Root forum*

 

[GTraymond]

*moved to Ace - All Things Root forum*

Thank you and sorry for posting in wrong section

 

[GTraymond]

Ok i already know how to install roms they are pretty easy but how will i keep a backup of my official 2.3.4 rom so i can restore back if something goes wrong or i dont like that custom rom?