Before generating a dump file, upgrade the app (to version 8.2.2 or higher).
The steps below describe how to migrate from Server to Cloud using Jira XML + BigPicture/BigGantt snapshot.
Steps overview
Before you proceed, please read the following instructions carefully and copy all the steps to a clipboard to keep them at hand. Make sure to complete each step:
Create a backup of the app data.
Create a backup of your Jira environment.
Restore Jira data on a new cloud environment.
Install the app on the cloud environment.
Restore the app backup on the Jira cloud.
Step 1 - Create a BigPicture/BigGantt backup of your server instance and download it
Go to BigPicture/BigGantt App configuration > Advanced > Database dumps
Click the New dump button. Add a description and confirm by clicking the Create dump button.
You will be able to track the progress:
The new database dump should appear at the top of the list of backups.
Press the Download button to save the backup file to the disk (if you don't see the item on the list, refresh the page).
Step 2 - Create a Jira backup and download it
Perform Jira XML backup and import (see below).
Don't use the Atlassian JCMA tool.
Go to System > Backup system and create Backup
Step 3 - Restore the Jira backup on the Cloud environment
Go to System > Restore System and Import data
Step 4 - Install BigPicture on the Cloud environment.
Go to Jira Apps > Find New Apps and search for the BigPicture plugin.
Install the plugin and enter a valid license
Step 5 - Restore the App database
Go to BigPicture App Configuration > Advanced > Database dumps
Upload the DB dump (that you created earlier on the server) by pressing the Import button
Restore.
Confirm the next step.
Check the confirmation box and press the Next button.
Confirm the operation by entering the word RESTORE and then press the Restore button.
Info: If the BigPicture instance is not new and some work has already been done on it, this work will be overwritten! BigPicture will automatically dump its current state before restoring it (so the process can be reversed). 
Map the users from the server to the users on the cloud side.
During Server to Cloud migration, automatic user assignment will be performed (the matching is based on the users' email addresses). There may be a situation where not all users on the Server side will be matched to the users on the Cloud side. In this case, manually assign users that were not mapped in the automated process (if there are too few users on the JC side, they need to be created before the restore operation):
Info: If there are a lot of unmatched users (more than 20-30), it may mean that the data from Jira was not migrated correctly. In this case, verify that the user data has been migrated.The database recovery process will start.
After the recovery process, the migration from one instance to another is over. You can go to the BigPicture application and verify the correctness of the data.
Additional information
Any integration instances after the restore operation will be in a “not operational” state.
This mechanism prevents a situation where two applications make changes in the same integration instance simultaneously.
To activate selected integrations, move the switch in the Active column in the App Configuration → Integrations → Connections panel.
