keep the last full of the last month of the year 15 years (copy to tape)

Hello again,

my old pseudo was Bloopa, I have no access to my old account because it was disabled. I've changed customer and I had to create a new account.

I use a selective copy to copy to tape all last fulls of the previous months.

The current retention is 1 years. for the last copy of the year, I want to keep the data for 15 years. How to achieve that in a simple way.

I see an option on the tape “un age Jobs” that allow to change the retention settings, but I am not sure if it is good.

Thanks !