You must always include filenames as the last argument on the command line. This argument specifies the source or contents of the backup.
For a file system, specify the raw device file as follows:
You can specify the file system by its mount point directory (for example, /export/home), as long as an entry for it exists in the /etc/vfstab file.
For a complete description of device-naming conventions, see Backup Device Names.
For individual files or directories, type one or more names separated by spaces.
When you use the ufsdump command to back up one or more directories or files (rather than a complete file system), a level 0 backup is done. Incremental backups do not apply.