Quantum govault 40gb Guia Do Programa

Chapter 5  Best Practices

Selecting GoVault Cartridges

GoVault™ Data Protection Software, Version 1.0 User’s Guide

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In most cases, selecting a cartridge size that is approximately equal to the 

total size of the data set will be adequate to protect a data set with a 

normal mix of fixed and dynamic file content, and without a high 

concentration of noncompressible files.

In these situations, for example, selecting an 80 Mbyte GoVault cartridge 

to protect an 80 Mbyte data set would support an initial backup of the 

entire data set, and then daily backups for several months before 

approaching the capacity of the cartridge.

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On average, an initial baseline backup provides a data compression ratio 

of approximately 2:1, taking about 40 Gbytes of disk space to back up 80 

Gbytes of data. Subsequent backups, however, only compress and store 

any new data and the portion of the original set that has changed since 

the prior backup. 
If you mostly make changes to existing files, or if you have multiple 

folders with duplicate copies of the same file, then multiple backups over 

a period of time can produce a virtual data compression ratio of 20:1 or 

more. 

If you mostly add new files, and seldom modify existing files, then the 

net data compression ration will remain closer to the original 2:1, overall.
When selecting GoVault cartridges, always evaluate the makeup of the 

data set you need to protect, and select a larger cartridge size if you have 

a high proportion of already-compressed files, or if you more frequently 

add new files than modify existing files.

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Using multiple cartridges to store your valuable data is a best practice, 

and is vital to your data protection scheme.
In its simplest form, cartridge rotation would consist of a second GoVault 

cartridge with a second copy of your baseline system archive that you 

would store in a safe place at a different location. On a regularly 

The term fixed files refers to files like video, music, pictures, 

and so on. Once created, they are seldom changed or edited. 

The term dynamic files refers to files like word processing 

documents, spreadsheets, project plans, presentations, and so 

on. They are frequently revised and updated.