Aren't mixing up a bit here?
Export wizard exports metadata into package files.
%omabakup copies metadata to different location.
Neither of these backups "physical" stuff like deployed jobs (.sas files) and tables.
So, %omabackup is probably a better choice if your environment is large a need an automated process for backing up metadata.
To backup physical files, you will probably use 3rd party software to do the job. If you have your data stored in external RDBMS or SPDS, refer to that products documentation regarding backup strategies.
Usually, backup jobs are not defined within DI Studio.
/Linus
Data never sleeps