How to migrate from DirectAdmin to Plesk Onyx?
Migration from DirectAdmin 1.5.1 can be done from Plesk, using the Plesk Migrator Extension.
Make sure last Plesk MUs are installed How to install Plesk updates
Go to Tools & Settings-> Migration & Transfer Manager and select Direct Admin.
Note: in case if Tools & Settings-> Migration & Transfer Manager is absent, install Plesk Migrator extension according to the article How to Install Plesk Migrator?
Note: when migrating from DirectAdmin installed on Ubuntu 10.x, only custom migrationis supported