First, enable these backups, which you do by turning on the “iCloud Backup” option in Settings > iCloud > Storage & Backup. Your device will then dutifully perform one daily, but only if it’s plugged in to power and connected to a Wi-Fi network. To force it to do one on your timeline, click the button labeled “Back Up Now” at the bottom of that same window (shown in-progress below).

Choosing that will perform an immediate backup of your camera roll (along with your iCloud documents and settings, text messages, ringtones, and so on), and you’ll even get a handy progress bar with the estimated time remaining. The only caveat is that just like the regular iCloud backups, these immediate ones require you to be on a Wi-Fi network (but you don’t have to have your device plugged in).
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Only got 3G in your cabana? No dice. Head out to that local coffee shop and use their network to make sure those wave-frolickin’ pics get saved.
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