OpsCenter - How far it can retain backup History

I want to configure OpsCenter for NetBackup 7.1 environment and have few basic questions. Your answers will help me making my decision. Thanks in advance.

1. How far OpsCenter database can retain backup History? Suppose I want to check if backup happened for servers 3 years back can I go that far (ofcourse I don't to restore it just want to check)

2. Does OpsCenter support reporting Vault, Duplication, Archive job types??

3. When the collector fetches the data from Netbackup Master server does it significantly affect the performance, particularly in a large environment??

4. What are the common issue faced before configuring the OpsCenter??

Thanks

Yogesh