1 Production Environment

3 Full Backups + 12 Differentials + 36 Transaction log backups on the production server

1 Staging Environment

1 Full Backup copied from Production at some ponit

1 Development Environment

1 Full Backup copied from Production at some point

1 Product Research Environment (SQL 2012)

1 Full Backup copied from Production at some point

Each environment has a copy of the database on the instamce.

All backups are compressed if that matters.