Are you talking about Freedesktop.org selfhosted gitlab instance? They have a week of planned maintenance. I don’t think gitlab’s main gitlab.com instance is going down for week.

Probably? I just have it setup to always be running in the background on my devices. So if it detects a file change to my sync folder that gets sent to all other devices currently connected. I use global sync so as long as the device has an internet connection or is on the same local network it should be able to sync.

There is an API to interface with syncthing daemon running on your computer https://docs.syncthing.net/dev/rest.html so if you wrote a program to track the nfc action and interface with that API I think you probably could.

No problem! I personally use syncthing to keep my password database synced between my phone, laptop, and desktop. As well as to keep some important files backed up between different devices that way if my hdd or something happens to one of the devices I have backup on the other ones.

So just sync over local wifi basically? I’m pretty sure you can do thing with syncthing if you just disable “global discovery”. You can read the local discovery protocol here https://docs.syncthing.net/specs/localdisco-v4.html but afaiu there is no cloud sync involved at that point and just device to device sync.