There is one option while creating backup job in Job setting i.e. SYNC checkbox. Could you explain, what it is ? I found below command in teradata documentations . I did not understand what it mean by -that are already being logged
Determines where synchronization is done for the job. Only available for online backup jobs.
For online archive, first logging must started, then the backup is done, then logging should be ended (and any temporary log dropped). This typically happens "under the covers", but if an online archive fails and you want to start over, it may be necessary to manually set LOGGING ONLINE ARCHIVE OFF.