I would recommend starting with official server migration docs. if you need more recommendations review existing topics tagged server_migration
I would not recommend such approach as this results in loosing all “cloud” functions created in the old instance - file versions and trash, file comments, shares, contacts and calendars (and most apps data)..
for snap I can’t tell but for “community” Docker image you could simply restore the DB dump and move the data of native install into right locations (bind mounts) as easy migrations step. pretty complete and advanced guide you find in Problems with How to docker-compose with notify_push (2024)
for each method I would recommend you do some tests major maintenance tasks (backup, restore, upgrade) before you completely switch to another platform.