new: [0km] output remote error when failing command `vps install backup`

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

bin/0km

@@ -736,7 +736,8 @@ vps_install_backup() {
     fi
 
     if ! out=$(ssh:run "root@$vps" -- vps install backup "$server" 2>&1); then
-        err "Command 'vps install backup $server' failed."
+        err "Command 'vps install backup $server' on $vps failed:"
+        echo "$out" | prefix "  ${DARKGRAY}|${NORMAL} " >&2
         return 1
     fi