The most common security issue is a hacked account. Just like with any online account, anyone who can guess your password suddenly has access to everything you've stored. When connected to your own personal computer, this puts even your home computer at risk of being hacked.
There are several ways to prevent this. First of all, always use a non-obvious password. Never use something like your birthday, address or anniversary. These are easy to guess. Take the time to come up with something unique, using a combination of upper and lower case letters along with numbers. Anytime you can replace a letter with a number, such as 3 for the letter E, do it.
If you access cloud computing accounts from your home or business computer, you are probably safe. However, accessing your account from any other computer, puts you at risk. You never know what type of security those computers use. It is possible for hackers to install keyloggers just for this reason. Only use computers you can trust if possible.
If you must use a public computer, change your password as soon as possible when you return home. Even if someone gets your old password, it will no longer be valid, keeping your account safe.
Image Credits: WikiMedia Commons / Rate