Quantumproof syncthing setup?

Is it possible, for example using a preshared key (password) instead of using public key algorithms in syncthing, or adding wireguard on top of it, but that probably wouldnt wort seamlessly on android.

Or any syncthing alternatives that dont use quantum vulnerable algorithms?

The threat is spying and storing data of the ISP (less likely) and for sending data to the untrusted node that act as a server so the sync always works

If you’re threat model is this high, then you’d be better off using Tails or Qubes, I think.

Eh not rly, just want to stop casual decryption of my data during some future mass decrypting program.

Do u know how likely is that my EU ISP is storing all/some of my data?

What exactly do you mean by this? Please elaborate and explain.

i mean all the data you send out to the internet or your local network
EU ISP = European union internet service provider

Yeah, then use a good VPN. You’ll be fine. This will protect your “data” or your internet activity from any ISP.

Mullvad, IVPN, and Proton are best recommended.