“VM disk size changed since last sync, deleting all restore points.” – Veeam Backup & Replication
Backup or replication jobs in Veeam Backup & Replication may sometimes report the following message: “VM disk size changed since last sync, deleting all restore points.” At first glance, this can look like a serious problem — losing all restore points sounds alarming. However, this behavior is intentional and protective. Veeam is designed to maintain data consistency and will automatically reset a replication or backup chain if it detects a change that could make incremental data unsafe to use. During every backup or replication cycle, Veeam compares source VM’s current virtual disk configuration to the metadata stored from the last successful job. If it detects any differences, it assumes the disk layout has changed and that existing restore points are no longer valid for incremental synchronization. When this happens, Veeam takes a cautious approach to preserve data integrity: This ensures the next restore point reflects the VM’s current, correct disk configuration, preventing corruption or restore failures in the future. Best Practices When Veeam detects that a VM’s virtual disk configuration has changed, it intentionally resets the backup or replication chain to prevent inconsistencies and ensure that all future restore points are reliable. By planning disk modifications around full backups and maintaining awareness of storage-related changes, you can avoid unnecessary fulls while keeping your replication and backup data consistent and trustworthy. For more information, please contact support@managecast.com.