Veeam Backup & Replication 9.5 Update 4
User Guide for Microsoft Hyper-V
Related documents

Virtual Full Intervals

When the tape job needs to create a new virtual full, it analyzes the tape archive and detects the date of the last virtual full on tape. To create a new virtual full, the tape job needs restore points that were created in the following interval:

  • The start of the interval is midnight after the last virtual full was created (the end of tape writing session).
  • The end of the interval is midnight after the virtual full day.

Virtual Full Intervals 

To synthesize a new virtual full, the tape job needs at least one increment created in this interval. If there are many increments, the tape job builds a virtual full up to the most recent increment within the interval.

Missing Source Backups

The source chain may not contain an increment on the virtual full day. In this case, the tape job uses a backup that is closest to the virtual full day within the virtual full interval. For example, if the source backup closest to the virtual full day was on Tuesday, the tape job will synthesize a virtual full that represents the machine state as of Tuesday.

Virtual Full Intervals 

The source chain may have missing backups because of the following reasons:

  • The source job does not run on the virtual full day.
  • The tape job has multiple source jobs scheduled on different days. Some of the source jobs does not create a backup on the virtual full day.
  • The source job fails to produce increments for several days, for example, because of a hardware breakdown, network inaccessibility or if the source job was disabled by the user for some time.
  • Some machines in the source job have corrupted backups. The tape job will use the last valid backups for these machines and create the virtual full up to the latest valid restore point.

No Backups in the Virtual Full Interval

The source job may not produce any backups after the previous full backup day. In this case, the tape job will not create a virtual full for this period.

Virtual Full Intervals 

Virtual Full IntervalsImportant!

The virtual full cannot be forced before its scheduled day. For example, if you start the tape job manually off-schedule, it will not create the virtual full if the virtual full day is in future.

This Document Help Center
User Guide for VMware vSphereUser Guide for Microsoft Hyper-VEnterprise Manager User GuideVeeam Cloud Connect GuideVeeam Agent Management GuideVeeam Explorers User GuideBackup and Restore of SQL Server DatabasesVeeam Plug-ins for Enterprise ApplicationsPowerShell ReferenceVeeam Explorers PowerShell ReferenceRESTful API ReferenceRequired Permissions ReferenceQuick Start Guide for VMware vSphereQuick Start Guide for Microsoft Hyper-VVeeam Backup for AWS DocumentationVeeam Availability for Nutanix AHV DocumentationVeeam Backup for Microsoft Office 365 DocumentationVeeam ONE DocumentationVeeam Agent for Windows DocumentationVeeam Agent for Linux DocumentationVeeam Management Pack Documentation
I want to report a typo

There is a misspelling right here:


I want to let the Veeam Documentation Team know about that.