xinit, Well, that's fun.
Mounted a WebDAV folder from a storage host, thinking "Hey, I can just copy my Google Photos from the Takeout archives into the folder that way."
I rarely work with DAV but assumed that it would let me know if it dropped the remote connection.
Nope. Lost the connection only a couple GB in but nothing TELLS me. It just carries on copying spontaneously to local path, and I start getting alerts that my root filesystem is filling up.
Bah.
Sftp it is, then.