3. Do not leave personal data in the cloud Online file-syncing services like Google Drive, SkyDrive and Dropbox have made things extremely convenient for many internet users. Clouds often do not offer data encryption and can leave your data vulnerable. Depending on the data you wish to store in the cloud, you should ensure that it is encrypted both in flight and at rest. Also keep in mind that companies offering these online services can witness technical problems, financial difficulties or even be sentenced by a court. So, before you choose, have a look at the FAQ and terms of services and conditions.