How to set the retention value to media pool for tape backup in Veeam?

This is using Veeam backup and replication 9.5. We are using a standalone lto6 single tape drive. There are altogether 10 tapes for 2 rounds of full backups from Monday to Friday. Since the contents for each day backup is quite small (around 100 GB), I am thinking of keeping 10 weeks' worth of backups for each tape, so, I set the retention to 10 weeks for this media pool. However, no matter how I twist and turn the settings on both media pool (borneo) and backup to tape job 2, I still can't get the subsequent backup contents append. Please see the attached document for the settings of media pool and backup to tape job.

Please enlighten so as I can store 10 weeks' of backup contents per tape or so. Thanks in advance.
Borneo-Media-Pool-and-backup-jobs.docx
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MichaelBalackAsked:
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David Johnson, CD, MVPOwnerCommented:
I'm thinking it is because of the create new media set for each backup session
https://helpcenter.veeam.com/docs/backup/vsphere/tape_media_sets.html?ver=95
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MichaelBalackAuthor Commented:
Hi David,

At the end, I still kept "create new media set for every backup session", but, change to use "do not protect data (cyclically overwrite tapes as required).

I have 2 sets of tapes for Mon - Fri backup. That means I can have a backup data of up to 2 weeks.
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MichaelBalackAuthor Commented:
Thanks for Expert David in pointing to the retention-related setting. By doing so, tape backup is working
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