Jira server migrating to cloud

[Boydinteractivejiraadmin]

Hi, We are trying to migrate Jira server to cloud via Cloud migration assistant tool. Tool says Warning found when I create the migration plan, but when I click on view warnings all checks are green. Any idea why it still says warning found? 

How long will it take to complete the migration? 68 users, 50G attachments. 

At any point, if the migration fails, can we fall back to the server version and continue using jira server till the error is rectified? 

[Alex Koxaras -Relational-]

Hi @Boydinteractivejiraadmin and welcome to the community!

Kindly reindex your server instance and run the JCMA again. This should clear things up.

Concerning the time, when you run the JCMA you will get an estimation of the approximate migration time. For an instance of a client of mine, with triple the users, but half the attachment, 3 projects and 11k issues (more or less) + apps, it took about 5 hours. I would expect in your case to be more due to the attachments size.