If hardware providers are available, Veeam Backup & Replication selects a hardware provider to create volume shadow copies on a volume. If no hardware providers are installed, Veeam Backup & Replication selects the VSS system software provider. If necessary, however, you can assign a VSS provider on every volume manually.
If both software and hardware providers are available for a volume, it is recommended that you select a hardware provider.
Software providers do not support transportable volume shadow copies and cannot be used for off-host backup.