Hi Pascal.
No, you don't need to do it from the beginning.
I advice to read docs about data aging.
The aim of data aging to free ram memory from unnecessary data(or rarely used), and access to aged memory is slower then to ram and require special procedure (technical functional modules). It means that it reduces your report's performance if you put 'daily used data' to the cold area.
Ideally you need to find "golden middle".