After running two different Synology units at home (years ago) I finally just moved everything to a mix of USB SSDs and cloud storage. I really wasn't using many of the more advanced NAS features very often. They were expensive toys if I'm being honest with myself.
I needed lots of storage, primarily, and there are cheaper options for that now. SSDs are also far more reliable than they used to be. I keep the "large but not critical" files on SSD and the "critical" files in the cloud.
Not trying to discourage anyone from running their own NAS. It can do more than just store files for you, and they are fun to mess around with. But if all you really need is reliable storage, shop around for other solutions would be my advice.