Money may be no object to you, but may well be for other readers, there for I'll keep budget in mind.
So if not budget, I assume that reliability and resilience are your primary concern. In which case, we can discard Bluray disks; no-one knows yet how these disks will fare over time, even if treated well. But given that they are usually physically more vulnerable, I'd certainly not rely long term on anything. In fact, I rip all my blurays disks as soon as I get them, just in case...
SO my recommendation is for a decent, even premium, NAS box running RAID 6 or 10, so you have (upto) 2 broken disks of leeway. 4 of the major players are Buffalo, Drobo, QNAP and Synology; I have experience of some sort with all other this companies' ranges, and I'd usually be happy with any of their offerings.
However, given that we're required to provide a recommendation, I'll plump for a a Qnap TS-431P which currently retails for approx 280GBP.
- 4 disk capacity -
- Supports RAID 6 and 10 (and others)
- Gigabit Ethernet, eSATA and USB3 connections
- Low power hardware - useful if always on
- Decent performance compared to peers
- Decent useability - consumer/SOHO focused rather than corporate
- Decent reliability - assumed by brand
- Can function as a private cloud server, if that is of interest
Note: It it not possible to start small with RAID6/10 and scale up as needed. You could go with RAID1 (mirroring), add a disk and move to RAID 5, and then later add a disk and move to RAID6/10, but for each move you'd need to copy your data elsewhere while you made your changes, so this is not practicable.