If you experience low disk space,  analyze your storage requirements and reduce the space currently being used by doing one or more of the following: 

• Reduce the retention period of selected backup jobs
• Reduce the scheduled frequency of selected backup jobs
• Remove existing backup jobs [1]
• Create exclusions in a backup job [2] 

For detailed instructions on any of these procedures, review the Backup Strategy chapter (beginning at page 42) of the Axcient UMC User Guide for more information. 

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[1] Note on removing existing backup jobs: Removing a backup job deletes all records of that backup, including all saved versions both local and in the Cloud. When a backup is removed, it is no longer possible to recover any data from that backup job. If it is an image job, failover VMs and BMR protection are no longer available until you create a new image backup job.             (See "Remove Backup Job" under Backup Strategy in the Axcient UMC User Guide .)

[2] Note on creating exclusions: Viewing the Backup Job Profiles report is the best way to gauge which files are generating the most incremental data. Go to Reports --> Profile (to the far right of the schedule name). This report shows which files are adding the most incremental data. If you notice any files here that could be excluded from the backup set, exclude them.