According to documentation https://help.sap.com/viewer/0fa6bcf4736c46f78c248512391eb467/v2105/en-US/d16a908895e84c5fa0588d1390371f78.html:
When the update is successful, old type systems older than 7 days are removed during the next deployment.
You would like to disable this feature.
SAP Commerce Cloud
SAP Commerce all versions
KBA , CEC-SCC-CLA-DEP , Deployments , How To
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