Changelist is a feature of Isilon that is used to track the changes between two points at a time.
When you have a large number of files and the number of files that are modified is minimum, the incremental backup operation takes a large amount of time as all the files are scanned for changes.
Commvault software creates snapshots whenever you run a backup operation. When you run incremental backups, the Changelist feature is used to identify the changes between snapshots which results in faster backups especially when you have a large number of files.
Procedure
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From the CommCell Browser, expand Client Computers > client > Linux File System or Windows File System.
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Right-click the subclient, and then click Backup.
The Backup Options dialog box appears.
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In the Select Backup Type area, select the type of backup that you want to perform:
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To perform a full backup, select Full.
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To perform an incremental backup, select Incremental.
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To perform a synthetic full backup, select Synthetic Full.
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In the Job initiation area, specify whether to run the backup job immediately or to schedule it.
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Optional: To set advanced backup options, click Advanced.
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Click OK.