welcome to WHT
from our experience,
An established adult paysite setup should include at least 2-3 servers for a decent backend.
A streaming server to host the content, and a frontend website server.
A third server ( less mandatory in case of tight budget)
- is intended to back-up your information and act as a failover solution in case of service faults.
as Lee pointed out - RAID 1 for data redundancy is Highly recommended.
I won't let a business client run without it for sanity reasons.
In ANY case - avoid shared hosting for streaming, it wont hold for a long run.
and never forget - backups - backups - backups !
Feel free to share your thoughts on this thread.