Web storage is online data backup and storage technology with access to the data from any Web browser anywhere in the world.
Simply speaking, you transfer the data over the Internet to a remote and safe location, where this data is stored on a highly reliable storage system, that is, RAID. This process ensures safety of your data in case something happens at your main data location (fire, earthquake, etc.). In this case, you can always restore the damaged data.
For details, go to Chapter 8.
There are plenty and the number is growing. Some names to mention are @Backup, idrive, FreeDrive, Driveway, and others.