I was asked to import a project and was wondering what are the best practices/tips for doing this. Is there anything I need to do before, during or after importing a project? Should imports only be done after-hours? How long does it usually take to import a 3G zip file?
My biggest worry is breaking something. What are the to do's or not do's?
the first general advice, but not limited to your question, is always to test on a non-production environment. Jira Cloud meanwhile has the Sandbox feature to accomplish such. Sandbox is available in Premium Plans and above.
The screenshot you showed is aimed towards a system restore. This operation is destructive and will remove any data before it imports data from a backup file you provide.
Please cross-check with the information given in this guide:
You mentioned you wanted to import a single project.
The appropriate documentation is available here:
An estimate on how long it takes the amount of data you mentioned is not an easy thing to do. It depends on your broadband connection and complexity of data.
Doing the export out of office hours is always a bonus.
Overall: most important step in my eyes is to choose the CSV import from admin panel and to test on a test environment (Sandbox or another cloud site).
If there is something to do after the import depends on the data to be imported. You will get an informational message on how the import went. If you look at those information you get an idea on what is still to do (if any). This, as said previously, depends from import to import, though.
Would it make sense for me to restore the zip file to my dev instance? then I can export the project and import it to my prod Cloud instance? I know it will overwrite everything in my dev instance but that's ok as long as I can import that project correctly using the csv method into our prod instance.
There are several possibilities and you would have to carefully check which one fits best.
You mentioned exporting data from dev instance and importing a project to cloud.
In that case you, indeed, have the option to export/import using CSV.
Probably also the migration assistant as noted would be an option: https://confluence.atlassian.com/jirakb/how-to-migrate-a-project-from-jira-server-to-jira-cloud-779160760.html
At the end the following charts helps finding the right way:
Important to note is that there is also an option which will overwrite the destination (Restore System/Jira Cloud Site import). For the live system something you want to avoid if I got you right.
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