We make daily backups of our servers.
Every month we write the backup data on tapes.
The retention period for these tapes is one year.
For December, we create an end-of-year backup with unlimited retention time.
Our goal is to have an annual backup for December and reuse the remaining months' tapes after one year.
Due to server retirement, there are monthly tapes that we cannot reuse without first deleting the contents (Retain time until: infinite). If we do so, we lost data.
Is there a solution to this problem?