Retention versus Data protection

I have a concern regarding Storeonce Catalyst Retention versus data protection periods (Backups and/or Pools)

So if i have different Retention periods for Backups, for example:

Daily backups 35 days

Weekly Backups 40 days

Montly Backups 5 years

Its reasonable i put the following periods for data protection as well DP as Storeonce Manager?

Daily Backups 38 days

Weekly Backups 45 days

Montly Backups 1 year and then configure an object copy to off site tape for rest of period 4 years?

 

Regards sorry but it seems i am confusing terms and features