Migration 7.5 to 10.1 and backups enviroments

Hi,

I'm planning a migration from 7.5NW to 10.1 and "2 backups enviroment". I think it's neccesary, beyond to migrate the enviroment in use, to do a restore of 2 backups enviroment and then run program migration, but is this true? if I perform these steps it is as if I did migration 3 times. Are there other way to perform this?

Thanks in advanced.

Regards,

Fernando.