Add backup admin task

boxes/silicon/admin

@@ -20,6 +20,48 @@ _apt-get-install () {
     done
 }
 
+backup() {
+    echo Hot backups
+
+    # Choose our destination
+    DEST=francium
+    if [[ "$(cat /etc/hostname)" =~ "francium" ]]; then
+	DEST=silicon
+    fi
+
+    pushd ~
+
+    # Note the -t parameter to rsync.  It causes the destination to conform the timestamp.
+    # This is important because when we do our next backup, it will use timestamp+size to
+    # skip, which does a great deal for speedup.
+    
+    rsync -tlrvzpP OTS Documents src $DEST:/home/james 
+    rsync -tlrvzpP /home/james $DEST:/home \
+	  --exclude "/home/james/Documents" \
+	  --exclude "/home/james/OTS" \
+	  --exclude "/home/james/src" \
+	  --exclude ".arduino15" \
+	  --exclude ".atom" \
+	  --exclude ".cache" \
+	  --exclude ".cargo" \
+	  --exclude ".cabal" \
+	  --exclude ".conan" \
+	  --exclude ".config" \
+	  --exclude ".cookiecutters" \
+	  --exclude ".dartServer" \
+	  --exclude ".expressif" \
+	  --exclude ".gem" \
+	  --exclude ".gradle" \
+	  --exclude ".recol" \
+	  --exclude ".ros_history" \
+	  --exclude ".roswell" \
+	  --exclude ".rustup" \
+	  --exclude "Android" \
+	  --exclude "snap" \
+	  --exclude "Downloads"
+    popd
+}
+
 lid-off() {
    echo Turning off lid-triggered sleep
    sudo mkdir -p /etc/systemd/logind.conf.d