I must have confused the type of "source" that backup to tape and backup copy job has. What was meant is, of course, "individual Job
, multiple Jobs
The assumption is that if the several jobs are selected as a source for backup to tape job, and this jobs have different "full" backup schedule, it might happen that two full backups that were transferred by backup to tape job belonged to two different backup jobs.
If it's not the case, kindly, open a ticket with our support team and let them investigate this behavior directly, since it's rather hard to speculate about the possible causes without seeing logs and actual environment.
I run synthetic full backups with reverse incrementals on Fridays.
Just to be sure - by "reverse incrementals" you've meant "synthetic full with rollback transform", not reversed incremental backup mode,right?