I wouldn't look so much at the disk configuration but at the backup method if you want frequent backups.
We have servers with around 2TB of user data, and these are snapshot and backed up twice an hour in around 10 minutes per pass, but this isn't because of our RAID 10 SAS Disks or even RAID 10 SSD database disks, it's because we have an R1Soft backup server and that performs backups at the block level and not at the file level.
We find R1Soft great as it integrates with our DirectAdmin and cPanel servers and allows customers to perform their own restores, which saves us time and offers our customers value.
We've used other methods in the past, but found they were quite resource heavy on the servers, whereas R1Soft CDP seems to be very resource light.
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Personally, I don't recommend raid at all.. Too many hardware complications, too many software issues, and it's just messy
As ughosting mentioned, there are alternative backup solutions. r1soft is good, but if you don't want to spend the $$$ for that, take a look at cpremote, which can do pretty much the same thing.
Tom Whiting, WHMCS Guru extraordinaire
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If it is within your budget Go for Hardware RAID 10 with BBU
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