I am using the Atlassian Cloud version for JIRA and Confluence. How can i move all tasks / a sprint from one project to another project?
you can use bulk move issues. see below link
https://confluence.atlassian.com/jiracoreserver073/editing-multiple-issues-at-the-same-time-861257342.html
As Gurpreet indicated you can use Bulk move to move multiple issues between projects. However, sprints do not get moved.
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