If necessary, you can specify a window for the backup copy job. The backup copy window is a period of time when the backup copy job is allowed to transport data between source and target backup repositories. The backup copy window can be helpful if you do not want the backup copy job to produce unwanted overhead for the production environment or do not want the job to overlap the production hours. In this case, you can define the time interval in which the job must not transfer VM backup data.
The backup copy window affects only the data transport process; transform operations performed on the target repository are not affected by the backup copy window. The backup copy job behavior during the ‘prohibited’ period of time depends on the length of the backup copy interval:
- If the backup copy interval is greater than the 'prohibited period’, the backup copy job will simply put on hold the backup copying operations and wait for allowed hours. The backup copy job is put to the Idle state and remains in this state for the whole "prohibited period".
- If the backup copy interval is smaller than the ‘prohibited period’, Veeam Backup & Replication will finish all backup copy job sessions that must run during the ‘prohibited period’ with the Failed status. During the first backup copy interval on allowed hours, Veeam Backup & Replication will copy the restore point to the target backup repository. The copied restore point will contain all data for the ‘prohibited period’. That is, it will aggregate all data that has changed between the latest restore point on the target backup repository and latest restore point on the source backup repository.
For example, you have set the backup copy interval to 2 hours and defined the backup copy window from 8 PM to 8 AM. Without the backup copy window, Veeam Backup & Replication would transport 6 restore points to the target backup repository between 8 AM and 8 PM. With the backup window, the backup copy job will not copy data from 8 AM to 8 PM. At 8 PM, however, a new backup copy interval will start. Veeam Backup & Replication will transport one restore points from the source backup repository. This restore point will contain VM data for those 6 restore points that might have been copied during the ‘prohibited period’ plus one that must be created within this new backup copy interval.