Confusion about tape handling & error displaying current backups on tapes ...

Hi,
we using a tape library with multiple slots to create weekly backups. The backup job ist a replication job, last full backups with 28 days retention time.
After a few weeks we get errors " Cannot find a free media in pool 'Woche' ", related to the tape capacity of 30TB and 4,5TB data every weekend impossible. But if we try to have a look into the tapes using the tape management there is no data displayed if we scroll down and pick up a host, only the first is accessible.
After reading some manuals I understand that Acronis Backup Advanced will only overwrite a tape if ALL backups stored on this tape are out of the retention time. But it seems that Acronis is writing parts of a backup if there is some free capacity on a tape with old backups, so the time to overwrite is 28 days again. Is that right?
What is best practice in this scenario? And how can we have a look on all stored data (name and date of backup) using tape management?
Many thanks,
Erik

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> But if we try to have a look into the tapes using the tape management there is no data displayed if we scroll down and pick up a host, only the first is accessible.
Erik, regarding this issue - could you please clarify, how exactly you attempt browsing the backups on a tape? There is indeed a known issue, when backups are not shown when selecting another machine to browse from (attached a pic showing this issue)
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