Imagine that you've built a house and installed every security tool in the books. Deadbolt locks, burglar alarms, guard dogs... you've got it all. Now imagine that you've left the key under the doormat, the alarm's access code written on a post-it on the wall (in case you forget it), and a box of doggie treats next to the kitchen that will serve as perfect hush money for Rover.
How difficult do you think it is to break into a house when the owner has rendered his own security systems useless?
A Cloud Server is no different. That's why we say that its security will ultimately depend on you. With that said, always be sure to follow these precautions:
Don't write your passwords down -- anywhere. Create passwords that you will remember, but make sure they're secure.
Alternatively, go ahead and make impossibly difficult passwords, then record them using a secure password-encryption program such as KeePass (or KeePassX). Just don't forget that master password...
Ensure the computer you're using to log into your Cloud Server is malware-free. It's not often considered, but what if a rootkit infected your Server by hopping over from your laptop?
When logged into your Cloud Server via SSH, especially on a computer used by others, make sure to lock the screen if you step away. You can do this in your operating system (for example, Windows+L or Ctrl+Alt+L), or by downloading and installing vlock on your Cloud Server. vlock may be available in your distro's package repositories.
Finally, make sure to log out when you're finished by typing:
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