I want to upgrade jira from 7.1.9 to 8.0, can anyone suggest me if I upgrade the version my existing data will remains there or not? what are the changes will occur in my existing Jira project. Please suggest.
The data will be retained in full.
For the changes, have a skim the release notes for Jira 7.2, 7.3 etc through to 8.0.
As @Nic Brough -Adaptavist- said, read the release notes. As for your data question, all of your data will be safe. As with any major upgrade, I would advise confirming you have a full backup available before starting work.
If you made any customizations to Jira you should back them up before upgrading.
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