Consider How You Want To Copy The Backup Data To An Off-Site Location; Consider Speed And Ease Of The Restore As Well As The Backup; Single Library Vs. Multiple Libraries; Single Library - HP 12000 Design Manual

List your backup applications. In a heterogeneous environment, you can have multiple
applications writing to different virtual libraries on the same VLS (which is highly flexible with
regard to the libraries that can be configured). This is similar to library partitioning but more
flexible and easier to setup and maintain. To reduce backup administration, always use the
fewest number of virtual libraries. For example, use one virtual library for each backup
application. (See
How long you want to retain the data on the VLS. (See
How fast your data is growing. (See
disk backup technology best fits because you should choose a technology that will continue
to scale in performance and capacity so that it can provide a single backup target even after
several years of data growth.

Consider How you Want to Copy the Backup Data to an Off-site Location

Think about copying the backup data to an off-site location for site disaster protection or long-term
archival. See

Consider Speed and Ease of the Restore as well as the Backup

If you are still within your backup retention period, you can restore the data directly from the disk
backup device. If you are outside of your retention period, you can restore from your long-term
retention tapes if you have created them. If your local disk backup device has been destroyed
(such as a site disaster), you can recover from your off-site copies (could be tape or could be
another replicated disk backup device). See

Single Library vs. Multiple Libraries

The VLS configurations are highly flexible with regard to the number and types of libraries. There
are two basic backup use models (single library and multiple library). The choice of which primarily
depends on the architecture of the backup applications. To reduce backup administration, use the
fewest number of virtual libraries. For example, use one virtual library per backup application.

Single Library

The single-library use model is a many-to-one configuration -- all hosts see one communal library.
This is the default configuration.
26 Backup Solution Design Considerations
Single Library vs. Multiple
Considerations for Copies
Libraries.)
Retention
Future Data Growth.) This is critical in deciding which
for more details.
Considerations for
Planning.)
Restores.