Hi @eungjun.yi,
Thanks for your question,
If you're looking to migrate servers you can backup your database and config.json file and move it to another server. The upgrade procedure could be modified to help do this.
Right now, there is not an option to export a single team. We had started work on this a few months ago, but community was upvoting a very different feature set, so we stopped work on it to switch to other priorities.
Would you be open to adding a feature idea on exporting teams so it can be upvoted?