Replication Director (RD) can perform all the tasks that you have mentioned however the time when you want these tasks to be performed could pose challenges in NetBackup 7.5
Netbackup 7.5
NetBackup uses Storage Lifecycle Policy (SLP) to implement RD feature. You cannot control schedules in SLP. it will automatically start the Operation 2 (snapvault) after checking two parameters -- which are 30 minutes from Operation 1 or 8 GB backup data ---- so the point is you will not be able to schedule operation 2 to run only during night and operation 3 to run during weekends.
NetBackup 7.6
NetBackup 7.6 (coming release) has a feature where you can add and control scheduling of SLP. In this release you will be able to perform Operation 1 (hourly snapshots) using backup policy schedule and Operation 2 (nightly snapvaults) using SLP schedule and Operation 3 (Backup to tape) using SLP schedule successfully.