Solstice Backup 5.1 Administration Guide

How HSM Complements Backup Operations

HSM is a complementary solution to backup, archiving, and save set staging operations. HSM allows system administrators to manage network resources more effectively, often resulting in lower cost for hardware storage. All Backup features store data on media; each one, however, has a specific purpose. Table 8-1 compares the goals of backup, HSM, save set staging, and archiving to demonstrate how these features work together to provide a complete storage management solution.

Table 8-1 Comparison of Backup, HSM, Save Set Staging, and Archive


	Backup	HSM	Save Set Staging	Archive
Goal	Protects data from accidental loss or damage	Conserves network storage resources	Moves data from one storage medium to another	Conserves online storage space
Files stored	Entire file system	Infrequently accessed files	Any backed up, migrated, or archived file	Rarely accessed files
Frequency	Regularly	Policy-based	Policy-based	At project's end
Method	Automatically	Automatically or manually	Automatically or manually	Manually
Original File	Left in place	Stub remains (can recall file)	Moved to new storage medium	Usually deleted
Method used to return file to client	Restored by administrator if data online is corrupted or accidentally deleted	Recalled automatically and transparently whenever user tries to access file	Restored by administrator if data online is corrupted or accidentally deleted	Retrieved by administrator if needed by users