Hi All. Is there any way to back up data(column description, table documentation, owners, tags etc?

hey Munyeob! right now our recommended approach to backing up data is to periodically do a MySQL dump for it to be recreated and re-indexed (docs: https://datahubproject.io/docs/how/backup-datahub/). Another experimental approach if you're using quickstart would be to check out these docs: https://datahubproject.io/docs/quickstart#backing-up-your-datahub-quickstart-experimental