I'm using Resilio Sync (former bittorrent sync) to make a backup sync from all devices (one-way sync) and then do a normal backup of that folder to other media

I'm using Resilio Sync (former bittorrent sync) to make a backup sync from all devices (one-way sync) and then do a normal backup of that folder to other media since a sync folder isn't really a backup. No cloud functionality, only your own devices with the speed of whatever network speed you have at home or on the go.