If you’ve a large number of small files and you care about your data then use Syncthing. I personally sync all my data to a ARM SBC (like a Raspberry Pi) and have all my devices configured to sync to and from that device. Works flawlessly.
I also use iOS and for that I’ve WebDAV setup on the SBC that provides me with seamless iOS integration. I also have FileBrowser running on the SBC pointed at the same data so I can have a nice WebUI to manage all files.