Confused about Jira Cloud import.... Does it overwrite EVERYTHING? (Cloud to Cloud)

[Deleted user]

I'm looking at the instructions on this page:

https://support.atlassian.com/jira-cloud-administration/docs/import-issues/

This says, "You can import issues into your Jira Cloud site. We recommend using this process to import data from third-party tools. " and then says what it overwrites. But I am not clear if it overwrites EVERYTHING.  

I want to take a Jira cloud instance, export a project, and then import the issues into a new project in a different cloud instance. For example, let's say I'm migrating a project. The project exists in a source instance:

SOURCE: https://CompanyONE.atlassian.net/jira/software/projects/SOMEPROJECT/

and I'm migrating to/creating a new project on another server:

TARGET: https://CompanyTWO.atlassian.net/jira/software/projects/SOMEPROJECT

This document says, "Importing entities.xml and activeobjects.xml will overwrite the database in your Jira Cloud site. Importing the attachments, avatars, or logos files will overwrite any existing attachments, avatars, or logos in your Jira Cloud site, respectively."

Does this overwrite EVERTHING on the server?

Or can I import the Issues from one project I've exported one project into a new project?

[Fernando De La Cruz Garelli · Accepted solution]

Overwriting the database means that any data that is currently on the target server will be replaced by the backup file from the source server. If you would like to move a single project between two Cloud instances a CSV Import would be better in my opinion.

Please refer to https://confluence.atlassian.com/jirakb/merge-multiple-instances-of-jira-cloud-779160767.html#MergemultipleJiraCloudsites-ImportissuesusingCSVimport for more information and other alternatives for merging Jira Instances.

[Deleted user]

Thanks for helping clear that up.