ACLs Using CIFS

If a CIFS volume is mounted on Linux system, it may not be possible to backup ACLs. In order to reliably back up ACLs on CIFS volumes these must be mounted on a Windows server with a Bacula File Daemon installed. If a large amount of data is involved, avoiding to send the data over the network twice my be achieved by installing the Windows server in a KVM host on the Storage Daemon server. By doing so, it will be possible to backup Windows ACLs and reduce the network load.

This virtual server should be started only during the NAS backup. Contact Bacula Systems for more information on this configuration.

Newer Linux distributions with recent Samba tools may actually allow to back up and restore security-related file metadata, though this is not fully supported by Bacula at this time. Please contact Bacula Systems support for more information.

In particular for file systems which are accessed both by Windows systems via CIFS and by NFS, and which are storing file ACLs for both access methods, a non-NDMP backup preserving all ACL metadata is often impossible, or would cause considerable resource consumption.