Syncthing

From there, I use Syncthing.

I had previously been using syncthing to sync & backup the photos, same as other files on my phone and laptop.

Now I use syncthing (no cloud needed)

I use syncthing to sync a folder with my laptop, so I just push a pdf into the folder on the laptop and then it turns up on the pinenote in koreader.

now I use Syncthing.

I've been using chezmoi + Syncthing for about a year now.

now I use Syncthing, further reducing my exposure.

Now I use syncthing over wireguard tunnels.

For Nextcloud, it could be a server, for direct synchronization that I use (Syncthing), my phone (almost always online) is the intermediate device for all.

I use syncthing-fork from fdroid, works great

Synchronizing with Syncthing works well enough both on desktops and smartphones.

I use keepass to store my password + syncthing to sync across devices