I sync if I have a good Internet connection, like from my hotel room or whatever, by VPNing into my home network where my NAS is. There are distributed DNS type solutions for a lot of the big NAS brands, where they’ll let you access your data through their service, but I never set that up because I already have a VPN. So my NAS and firewall are configured not to allow outside connections to that device.

But if I haven’t synced laptop to NAS yet, then copies exist on both my camera SD cards (redundant double SD card) and my laptop.