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18.10.2024, this is about file backup.

!Windows
On Windows I used [SyncBackFree|https://www.2brightsparks.com/download-syncbackfree.html]. This worked well, but you need to trigger it on demand.

!![Syncthing|https://docs.syncthing.net/users/config.html]
see [heise CT article|https://ct.de/yub8]

! On Raspberry PI
{{{
get source signed key
> sudo curl -s -o /usr/share/keyrings/syncthing-archive-keyring.gpg https://syncthing.net/release-key.gpg
add source to package lists
> echo "deb [signed-by=/usr/share/keyrings/syncthing-archive-keyring.gpg] https://apt.syncthing.net/ syncthing stable" | sudo tee /etc/apt/sources.list.d/syncthing.list
check
>sudo vi /etc/apt/sources.list.d/syncthing.list
install
> sudo apt update
> sudo apt full-upgrade -y
> sudo apt install syncthing -y
start/stop
> sudo systemctl enable syncthing@markus.service
> sudo systemctl start syncthing@markus.service
> sudo systemctl disable syncthing@markus.service
> sudo systemctl stop syncthing@markus.service
enable web gui for all IP addresses (config.xml is created after first start only)
# configuratrion
> sudo vi ~/.local/state/syncthing/config.xml
> sudo vi ~/.local/state/syncthing/config.xml 
    update line:  <address>0.0.0.0:8384</address>
> sudo systemctl restart syncthing@markus.service
}}}
Web Guid at [http://raspberrypi5:8384]\\
API can be used with header: X-API-Key=<see web gui preferences>
{{{
https://raspberrypi5:8384/rest/pending/folders
}}}

! On Rented Linux Server (Debian)
config file (keep standard)
{{{
vi /home/markus.ebel/.config/syncthing/config.xml
}}}

Add [Reverse Proxy|https://docs.syncthing.net/users/reverseproxy.html#] for Apache
{{{
> a2enmod proxy_http headers
add to /etc/apache2/sites-enabled/000-default-le-ssl.conf inside your default <VirtualHost>
<Location /syncthing/>
    ProxyPass http://localhost:8384/
    ProxyPassReverse http://localhost:8384/
    RequestHeader set "X-Forwarded-Proto" expr=%{REQUEST_SCHEME}
    Require all granted
</Location>
}}}

commands
{{{
sudo systemctl enable syncthing@markus.ebel.service
sudo systemctl start syncthing@markus.ebel.service
sudo systemctl restart syncthing@markus.ebel.service
}}}

[https://www.inetone.de/syncthing/]  (trailing slash is mandatory!)

! Issues
"failed to setup inotify handler. Please increase inotify limits" > see [https://docs.syncthing.net/users/faq.html#inotify-limits]\\
add following line > sudo vi /etc/sysctl.conf
{{{
fs.inotify.max_user_watches=204800
}}}
Then reboot or execute 
{{{
echo 204800 | sudo tee /proc/sys/fs/inotify/max_user_watches
}}}