Network backup systems can back up heterogeneous IT environments incorporating several thousands of computers largely automatically. In the classical form, network backup systems move the data to be backed up via the local area network (LAN); this is where the name ‘network backup’ comes from. This chapter explains the basic principles of network backup and shows typical performance bottlenecks for conventional server-centric IT architectures. Finally, it shows how storage networks and intelligent storage systems help to overcome these performance bottlenecks.
Before getting involved in technical details, we will first discuss a few general conditions that should be taken into account in backup (Section 7.1). Then the backup, archiving and hierarchical storage management (HSM) services will be discussed (Section 7.2) and we will show which components are necessary for their implementation (Sections 7.3 and 7.4). This is followed by a summary of the measures discussed up to this point that are available to network backup systems to increase performance (Section 7.5). Then, on the basis of network backup, further technical boundaries of server-centric IT architectures will be described (Section 7.6) that are beyond the scope of Section 1.1, and we will explain why these performance bottlenecks can only be overcome to a limited degree within the server-centric IT architecture (Section 7.7). Then we will show how data can be backed up significantly more efficiently ...