As it is described on the Data storage and synchronization page, the Timetracker Cloud version using the Jira worklog objects and database. We only synchronize the work logs from your Jira Cloud Instance to our servers, in order to be able to provide high performance and fast response times in the Timetracker Application.
If you run into any issues during your migration or have any questions regarding to it, please don't hesitate to contact our support team.
What you should do before migrating to the Cloud?
Remove worklog visibility restrictions from Issues in the Jira Server/Data Center.
If you are using worklog visibility restriction in the Jira Server, remove these from the worklogs to grant the ability for the app to synchronize these worklogs.
You must do this on the Jira Server instance since Atlassian removed this feature from the Jira Cloud.
What you should do after migrating to the Cloud?
User and Administrator preferences/settings does not migrating yet. The Jira administrator should re-configure the Timetrackler Cloud app on the Global Settings according to the server version.
Users should also re-configure their preferences in the User Settings. The new user wizard will help them with it.
Make sure, that the “atlassian-addons-admin” group or “atlassian-addons-project-access” Project Role are added to the necessary security level.
Make sure, that the “atlassian-addons-admin” group or “atlassian-addons-project-access” Project Role have “Browse projects” permission configured in the permission scheme in these (or all) projects in Jira.