It might be that your SSD format is incompatible with your new MacOS. if it is formatted to MacOS extended then your SSD should support new updates as well as be backwards compatible with older MacOS. Unfortunately there are no ways to get it back onto your updated system unless you have an older MacOS that will read your drive.

Of course, it’s reinstalling the whole system

Yes I have the UGreen 8 Bay (DXP8800 Pro). Dual 10GbE network ports (which can be link aggregated as well (20G bandwidth for download speeds up to 2500MB/s). 12th Gen 10-Core Intel i5 CPU. Eight 24TB capacity bays (of any brand, not restricted like Synology). Two PCIe 4 x4 M.2 NVMe slots expandable to 16TB (8TB each). DDR5 RAM expandable up to 96GB / 4800MHz. Dual THUNDERBOLT 4 ports and a PCIe x4 expansion slot. Software wise UGREEN allows you to install your software of choice (TruNAS, Unraid, HexOS, etc.) if you don't like their OS, without voiding the warranty. I've been very happy with so far. I also own their 4 bay (DXP4800 Plus) which has many of the same features. For me, that's what a 2025 nas should look like.

Newer doesn't mean better. Its hard to beat Synology.

@@CAMTechChris Hi there. I completely agree. There a few new models that I would say are not better than the ones before it, but that being said, there are several that are. In the case of the 8 bay Synology 1821+ that Emilo has in this video, it's a $1000 US Dollars, has a four year old AMD Ryzen Embedded V1500B CPU that ranks 1988th in multithreading (out of 4921 CPUs), 2799th in single threading (out of 4921 CPUs), and 255th out of 1042 Mobile/Embedded CPUs. Has very costly upgrades, has dated, slower PCIe lanes (Gen 3 x1 when others are coming with Gen 4x4 standard), has dated USB ports (3.2 Gen 1 when others are coming with 3.2 Gen 2 standard), has 4 1Gbe NICs (when others are coming with 2.5Gbe and or 10Gbe standard). Also with Synology you have restricted flexibility. All upgrades must be Synology or they want honor the warranty. So if you want to upgrade to be competitive to the new 8 Bays on the market, here's what you're paying: Dual 10Gbe port PCIe Card $270 (E10G30-T2), or even a single 10Gbe $140 (E10G18-T1), 16Gb of Ram (D4ES01-16GB) - $350 ea., so $700 if you max ram to 32Gb (when others are allowing max ram of 64 and 96GB, and again its DDR4, not DDR5 from any brand you chose). Add another $560 if you want NVMe M.2 SSD as well (SNV3410 - 800GB, $280ea x 2)Those upgrades alone close cost more than the nas itself. So my point was, if I was doing a “Best NAS of 2025” video, I would not recommend an 8 Bay unit that has a 4 year old cpu that ranks in the bottom 50% or 25% of the cpus on the market today, has dated components, and a restrictive & expensive upgrade path, at an all in price of $2,530 USD ($1000+$700+$270+$560). That does not sound like best 8 bay nas deal to me in 2025.

@@CAMTechChris Thanks, I'm between Synology and UGreen -- why would you favor Synology over UGreen? I'm a beginner, and would appreciate the advice.

@@darwishmd​​⁠I only have experience with Synology NAS units. I’ve been using my three Synology NAS units for 5 years and have had zero issues. The operating system is rock solid. Synology been in the business for many years and have a solid reputation. For these reasons I won’t even consider switching. Ugreen, on the other hand has had some questionable tech releases in the past few years, in my experience.