When we import backup into jira cloud it overwrite the existing data so I don't wanna loose my existing projects that's why I want to import my backup all at once not in chunks.
Welcome to the Atlassian Community!
I'm afraid that's way too large for a single Cloud import. We've had to work directly with Atlassian to be able to bring in far smaller files than that.
It looks like you're new here. Sign in or register to get started.