While their latest adventures into trying to force people into buying their branded hdds sucks I must say I really enjoy using Synology NAS as a storage location and their Hyper Backup software works great with rotating usb drives (setup one task per disk and disable notifications on the task if the usb drive is disconnected).
I found a Synology became a lot more responsive when I installed an extra 16GB of RAM (Crucial 16GB DDR4 3200MHz CL22 SODIMM CT16G4SFRA32A works in both Synology DS224+ and DS443+)

If I were to build a new storage solution at home today I would look at ZFS-2 and 5 large HDDs (probably 16TB drives)
itsfoss.com/what-is-zfs/
I’d put it in a Jonsbo N2 or similar case and combine it with an M-ITX Intel N100 integrated motherboard and a PCIe SATA Expansion Card.
Then I would continue to run two devices and have most services run on another device using the Jonsbo N2 primarily as a storage device. If you don’t need to transcode 4k Blu-Ray or something then the N100 is fully capable of hosting a Jellyfin server.