About the Overwrite existing file option during restore
For D-NAS restores, it is recommended to enable the option to restore the directory metadata.
In D-NAS backups, the files and folders of the NAS share are backed up in different backup images. During a restore, a file inside a directory may get restored first, and then the directory gets restored from another backup image. For example, the file /vol/dir/file is in the image: image1, and the directory /vol/dir is in the image: image2. During a restore, the image1 contents may get restored first, when the directory is not present. At this point, NetBackup creates the directory, but without the attributes of the original directory. During the restore from image2, the restore process finds that the directory is already created, and it must be replaced to restore the original directory attributes. So, to restore directory metadata, the option must be enabled during restore.