Veeam has been a pioneer in 64-bit virtual backup. Its architecture is fully 64-bit, supporting VMware and Hyper-V with features like:
For KVM-based environments, Proxmox’s 64-bit backup server provides deduplication, compression, and encrypted remote synchronization.
For large 64-bit VMs, set snapshot consolidation windows during off-peak hours. Avoid leaving snapshots open for more than 48 hours—this can degrade VM performance.
Symptom: Changed block tracking resets or fails for VMDKs over 4 TB.
Solution: Ensure your hypervisor version (e.g., ESXi 7.0 or later) supports large CBT. Perform a manual CBT reset: vim-cmd vmsvc/get.summary [vmid], then disable/re-enable CBT.