Backup and Disaster Recovery Procedures

Hi Friends,
I need to write a script to check the following things
1. Type of backups using for all databases
2. Need to check whether system databases are include in backup plan or not
3. Access to Backup files---Restrict restore permissions to DBAs and db_owners.
4. replication agent runs under SQL Server Agent account
5. Prevent SQL injection by validating all user input before transmitting it to the server.
6. Check the Audit level in SQL Server
Thanks,
Reddy