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Accessing NAS when not on LAN
(lemmy.ml)
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If you have a public IP and can forward ports, exposing SSH (with key-based login) is quite safe. You can browse the server storage and copy files to/from your phone.
If you can't open ports you will need something that punches out of NAT and intermediates a connection to your phone. Simplest way is to use a service like Tailscale, you install and start it on both the server and your phone and they will see each other from wherever they are.