QNAP Security VioStor NVR (Version: 4.1.2) - Manual (Page 205)

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Backup buffer: The time it takes to move recording files to the NAS. The maximum
value is 12.
3. Edit: Modify NAS settings on this page.
4. Click “Storage Expansion Assignment” to choose a NAS as the storage unit for each
channel.
5. Review all the configured settings and recording storage details under “Overview”.