Often times it happens that we need to migrate from one Redmine installation to another Redmine. Specially when upgrading to latest version. But we want to keep our database intact and want to migrate all the data to new setup. There are lot of guides on internet about redmine database migration, this blog post talks about traditional datbase migration along with case where projects in redmine instance needs to be merged with projects running in production environment. Step 1: BACKUP the existing database First of all take a backup of existing database.Backup is necessary in both cases .Whether we are installing new redmine on same system or if it is on new system . Use following command to create a