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One other nice thing with Resilio Sync is that it supports selective sync on an easy per-folder/file basis. While you can sort of do this with Syncthing by using ignore lists, it’s much easier with Resilio since you can just right-click/open files you want to keep on your device.
Seafile ‘scrambles’ files and doesn’t make them available to other applications on the host, which I don’t think OP wants.