Docker
Migrate from Synology Docker to Docker on dedicated server
Export from Synology
Export the container after connecting the Synology via SSH, using the image name as such:
sudo docker save <image_name> > /volume1/<path_to_export>/your_export.tar
That creates a Tar file with the entire container inside. Can be quite large.
Import from archive
Import the container using the command on the destination host:
sudo cat your_export.tar | sudo docker load
Move file around in LAN
Web server usually runs on /var/www/html so dumping the export there on a intermediate computer allows for the destination host to download it via HTTP:
wget http://<computer_ip>/your_export.tar
Reference: https://bobcares.com/blog/move-docker-container-to-another-host/