I think once you need a driver for storage to work, you invite problems. I will never use any such storage solutions.
A lot of misinformation about synology.
I believe there have only been 3 providers that let you have expanding raids with disparate drives. Originally Drobo. Now defunct. Synology SHR/2. And most recently terramaster’s traid.
You can definitely use Time Machine on any of those.
Synology does not force you to use only their proprietary drives. They will just give you a useless “warning” that the drive is not supported, but it will run just fine and do anything with the 3rd party drives. The only exception is using nvme ssds can only be used for cache but not stand alone volumes. And those limitations only apply to machines supporting more than 6 bays (For 2022 or later models, so no such limitation on the 1821+ 8bay unit)
You are correct none of the NAS options support native storage of apples brain damaged photolibrary nor direct app backup. All other file types work fine native, even weird directory types of files. But Time Machine works just fine on synology, and you can put a sparse bundle dmg on the synology and use that as a native container for any Mac files including photolibrary and Mac apps. You can even make some scripts to automount such DMGs.
Ive been using synology for over a decade. It does a lot right. That said I do hate their current direction, but they are probably the best game in town if you value the expanding raid type.
The best hardware by far is by qnap. They don’t have expanding raid but they have u.2 and fiber networking and more amazing options. Unfortunately I need and value the expanding raid ability so I can’t consider them, but they have some truly nice hardware options:
A brand new QNAP TS-h1290FX just rolled into the lab. AMD CPU with 8 DIMM slots, 4 PCIe slots and of course, 12x NVMe SSD support. 2x 25GbE on board with a few 2.5GbE ports as well. Starts at $4900, our review is in the works. #qnap #nas #storage @QNAP_nas
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Good luck and let us know what you end up with!