Hi
Go to this section below you can select all devices and the select archive it will give you the time options , remember Prime stores it configs it backs up inside the DB so if it fails you lose your configs too if you cant get it backup , so you must keep DB backups too or do what we did and go into prime DB and use kron to send the backupsx stored in the DB to externals NFS servers to have copies outside prime as another option for resiliency , if you going to the second part of external servers i would work with TAC on it
Inventory / Device Management / Configuration Archive