Odroid HC4
Second the HC4.
The HC4 is a good choice. Another would be the Rpi5 with geekworm x1008
is there a noob-proof tutorial and a ready image for it? for the hc2 i got my images from the armbian-page.
omv8:armbian_trixie_install [omv-extras.org]
Can I install it on a emmc?
Use the micro SD card. The hc4 doesn't have emmc.
The Case for the the hc4 is pretty ugly ... i have to see what i will get for my two hc2 with cases in the bay. I'm a little bit sad, that the hc4 remains with booting from sd. Even unraid works on booting from HD 
Last (not so) newbe-Question: When I takeover the the HD from the OMV7-Server, can I keep the Data or must I, so I want to install a Array, restore from Backup (a little bit funny by a "backup server")
I'm a little bit sad, that the hc4 remains with booting from sd. Even unraid works on booting from HD
OMV is not the reason the HC4 doesn't boot from a hard drive. That is a hard decision. Can you literally only need u-boot on the SD card. You could move the entire OS to the hard drive. But why??
When I takeover the the HD from the OMV7-Server, can I keep the Data
yes
NAS hardware is rather expensive for what they offer (they usually have low spec cpus soldered to the mainboard without the possibility to upgrade and rarely they have upgradable RAM, but they offer a beautiful case).
Instead you can find cheap refurbished small form factor PCs with upgradable memory and i5/i7 gen 7 or newer CPUs (that are not soldered to the motherboard) that also have SATA ports, and these can be used as NAS hardware (by installing OMV for example). Prices may vary but you can find such hardware for less than 100 US $. just search for one that has the number SATA ports you need or that have pciex ports (so that you can install a pciex to sata adapter).
I've also seen on thingy verse some projects of 3D printable cases and with these, you can easily transform a SFF PC to a somehow NAS like case.
QuoteIs it better to invest some bucks and buy a machine like the ugreen dxp2200 or simiar? Is it worth it?
Any N100-N150 low power NAS will do the job, if you need decent hardware and several discs.
You may also look at N100/N150 NASes using NVMes.
Example: beeline mini-me-mini-n150 with 6 x NVMe slots, DDR5 RAM and 2,5 Gbit/s network, with passive cooling.
Link: https://www.bee-link.com/products/beelink-me-mini-n150
I also agree with jgyprime that refurbished hardware is cheap.
Example, check my config.
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