online backup offers greater electronic security
Imagine you were a soldier in the middle of a battle and wanted to send a message to a Sergeant elsewhere on the battle field. To prevent the enemy from picking up and understanding your message, you might use a special code. In other words your message has been encrypted and only those who understand how to decode it can understand it.
When you backup files and folders to to DVDs, backup hard disks, tapes, etc they too can be viewed by anyone who has access to your computer - either with permission or otherwise. The most common way to prevent non intended access is by encrypting your files where only you know the key (an encryption key is simply a secret arbitrary alphanumeric word).
With online data backup, files are automatically encrypted before leaving your computer. They are also stored in an encrypted state. Only you and others who know the encryption key can gain access.
The vast majority of backup systems today using tapes, DVDs, etc don't encrypt their files at all. If someone else did gain access either my mistake or malicious activity you would be left wide open. With professional online backup services you are obliged to encrypt all your files fro greater electronic protection - you don't have to worry about it.
In the year 2005 a large financial company was sued for millions of dollars because unlawful access was obtained to highly sensitive customer data. As a business, you are legally obliged to ensure this doesn't happen - online data backup takes the pain away.
Gain greater electronic security with professional online data backup, Linux backup