Thanks just that I might have some kit becoming available but they are all different Dell models, just wondered if the Hard Drive space/RAID matched that would be OK for a test lab,
R610, 64GB RAM with 4x 600GB SAS
R410, 64GB RAM with 4x 600GB SAS
Sounds like it will work just fine for a test lab, anyways, once you get down to testing, DM me and I'll get you in touch with an engineer, who will review your environment to make sure everything will work perfectly.
See now I want to purchase more lab equipment to test this. . . .
In scenarios such as these what would be the recommended backup approach: DAS, NAS, Backup Appliance, lower end server, removable disk storage, tapes (intentionally left out cloud)?
Should be separate (physically!) entity non-related to your production cluster. Cheap NAS is OK.
For the average scenario (and I really just mean average) it's Synology or ReadyNAS that I recommend. Easy, supported, cost effective, desktop or rackmount options, well known, good brands, nice features.
@LAH3385 might be good to start a thread and try to determine what your needs are before going down the path of technology. By the time you were asking this question, you were already in pretty deep assuming certain products, product categories and platform HA. We should start with a business needs analysis, use that to set goals and then use the goals to select technology approaches.