For recording you usually look for a silent pc. Are these silent PC's ? I have my doubts.
How many user data do you have already ?
Do you use virtual instruments ? Superior Drummer 3.x requires already 260GB diskspace alone.
If you record bands then you might require a more portable solution, laptop ?!
You should use a SSD, where at least the Operating System, Programs and sample libraries fit onto.
Something like an Samsung EVO with i.e. 512GB better 1TB.
And then eventually an additional Harddisk of 2-3TB size for user and bulk data ...
You need to plan for backup / recovery:
Internal Backup Disk for speed ... if you would have 1TB SSD and 3TB harddisk, I would take a 4-6 TB internal disk.
And the same size as an external USB 3.1 gen2 disk.
For performing backups I can recommend Macrium Reflect.
X10SRi-F, E5-1650v4, Win10Pro20H2, Cub11Pro, UFX+ (v0.9735), XTC, 12Mic, ADI-2 Pro FS R BE