db_snapshot() # usage: [live=] ctl=... from=... [to=...] db_snapshot

# ctl(cmd:{start|stop}): daemon controller that takes command param

{

	echo_func; kw_params live ctl from to; : "${ctl:?}" "${from:?}"

	local_export live="${live-1}"; local to="${to:-$from.bak}"

	sudo mkdir "$to"

	sudo "$ctl" stop

	prep_try; local_dir="$from" remote_url="$to" inplace=1 "try" sudo upload

		# inplace: for large files, don't re-copy entire file

	sudo "$ctl" start

	rethrow

}