When the DMS server resides in a virtualization environment (such as ESXi, Hyper-V, or the likes), it is most expedient to snapshot and save the whole VM from within the virtualization environment. This will make sure that the whole environment plus repository content will be snapshotted at the backup time which is considered most reliable.
Note: Hyper-V installations may require additional backup of the postgres database since silencing of VMs is sometimes not correctly possible, albeit this is a rare event.
If the DMS server is not operated from within a virtualization environment, sector-level copies of the drives are considered most secure.
For discussion of alternative backup solutions please contact Patrix and/or Practice Insight.