One of the things they suggested is to spend your money on external SSDs for extra storage, rather than buy it at 10 times the market rate from Apple. Some here have been adamant that additional internal storage is essential but my experience with the 2018 Mini is closer
That's just silly. Although NVMe blades have come down in price, 10x is a ridiculous number.
The Mini M4 had USB 4/TB3/4 ports while the Mini M4 Pro has USB 4.2/TB5 ports. Unlike Windows, all are backward compatible to USB 2/1.1 skipping over USB 3.2 gen 2+2 (old 3.2) that Apple has never supported except as TB2 (needs the adapter).
USB 4 (TB3/4) housing with switchable fan and heatsink $99. Trust me on that fan if moving large chunks of data such as your Kontakt libraries—I leave it off otherwise.
https://www.amazon.com/ACASIS-Enclosure ... search_btf
TB5/USB 4.2 — gotta pre-order loaded from OWC and I don't see any empty yet from anyone. I'll save OWC's uhh...
marketing for another day—2800 is still the max data speed for TB3/4/USB4.
https://eshop.macsales.com/shop/owc-envoy-ultra
All the blades below are at least NVMe4 x4 — they will run faster in a USB 4.2 enclosure when they become available. The new 8TB WD Black is about $250 less than the least expensive blade I found two weeks ago when researching this for someone.
Onboard minimum = 512GB
+ 512 to 1TB total — Apple $200; Crucial $40 + $99 USB4 box difference = $60
+ 1.5TB to 2TB total — Apple $600; Crucial 2TB (for 2.5TB total) $133 + $99 USB4 box difference = $368
or Envoy Ultra 2TB, TB5 @ $399 — difference = $201 — when it ships.
+ 3.5TB to 4TB total — Apple $1,200; Crucial 4TB (for 4.5TB total) $236 + $99 USB4 box — difference = $865
or Envoy Ultra 4TB, TB5 @ $599 difference = $601 — when it ships.
+7.5TB to 8TB total — Apple $2,400; WD Black 8TB (for 8.5TB total) $650 + $99 USB4 box difference = $1,651.
5TB—N/A so far. When it becomes available will be a lot more. There will be heat issues to solve before that happens—otherwise, OWC would be offering it.
Ok, absolute worst case is 3.2x.
None of this takes into account that the 8TB are using a pair of NAND running RAID 0 — nearly twice as fast as those using single NAND.
As for myself, I have 8TB storage onboard + an 8TB blade in one enclosure plus a 4TB blade in another.
Occasionally, I boot from one of my externals and it's like swimming in molasses compared to my System drive. Apple doesn't want us doing that and some apps will not load if booted from an external due to certain .kxt files failing to load—all MOTU Audio interfaces requiring drivers fall into that category (oddly enough MOTU MIDI units work just fine). Since testing is the only reason for me to boot from an external, I'm in no hurry for TB 5 and expect this machine to be good for a long, long time.