Oh, the initial costs are of course quite high, including all disks I'd say about 1000 eur, so it's quite the hobby (I have a nice Fujitsu motherboard (3 y/o) and Fractal Design case (12 y/o), it saw 3 builds now, I started with a super cheap atom based board, then a Pentium dual core, and now the corei3 system that can handle a lot more disks, the nvme root drive makes it so fast.) I wonder about my next system. I also have a corei3 based Nuc (as htpc) and that thing is also very fast, silent and energy efficient. And it has nice and fast external I/O. Not sure yet, but my current system will last at least another 5 years.
My father has a Synology NAS and for some time I thought that would be my next system because I'd get tired of the associated sys-admin tasks at some point (I started with a Gentoo system and there were no containers, meaning you have to set up php-fpm, then mariadb, then download Next(Own)Cloud, then update it regularly, pff and the migrations to other systems...). But docker-compose really changed that for me, I think the Synology would be more work.
Btw, a nice podcast on Selfhosting where I got a lot of inspiration from: [0]