How would you setup this?

[kjo@deif.com]

We have around 40TB data.
About 2-3TB is generated/changed everyday (mainly because of Exchange, databases, logs etc).
4 servers are above 6TB alone.

For backup we have 2 servers with Windows Server 2019, each has a disk array with 12x14TB disks connected through HBA. And tape for offline.

We wanted to go with storage spaces mirror, ReFS, incremental + weekly synthetic full. Then use dedup as we can save a lot of storage, however we have 4 servers that goes over the 4TB file limit and fast clone doesn't work with dedup.
Maybe we're better off buying a RAID card and going RAID6 without dedup?

How would setup this?

[HannesK]

Hello,
I would go with the RAID controller (with BBU of course) and no deduplication, but with REFS. It's a setup that is known to be reliable and that's the main point for backups from my point of view.

Best regards,
Hannes

[kjo@deif.com]

Do you think RAID6 is enough? With RAID10 we would have almost no space.

[HannesK]

if the controller supports triple-parity, well, go for triple parity

if you follow the 3-2-1 rule, then you have a copy of your backups anyway. I don't see many customers doing RAID-10. Even in RAID-10, if you loose the two "wrong" disks, the RAID is broken.

[kjo@deif.com]

Thank you for the prompt response.