I use synology. I’ve done freenas, openfiler, even just straight zfs/Linux/smb/iscsi on Ubuntu and others. Synology works well and is quite easy to setup. I let the nas do file storage. And tie other computers to it (namely sff dell machines) to do the other stuff, like Pi-hole or plex. Storage is shared from the nas via cifs/smb or iscsi.

Synology also has one of the best backups for home use imho with Active Backup for Business. It can do vmware, windows, max, Linux etc. I actually have an older second nas for that alone. But you can do it all in one easily.