With online data backup, files are available to the user anywhere there is Internet access. However, these data files face a risk of unauthorized access from hackers. To keep files safe and private you must encrypt your files as Internet hackers may interfere with files which are not properly encrypted. For this reason it is also advisable not to upload highly sensitive information to those public online backup systems which do not require payments. To find the best service provider for your needs, carefully read and understand their policy, terms and conditions.