diff --git a/.gitignore b/.gitignore
index b47985c..bec3509 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@ html/
 **/.*/
 **/*.jpg/
 **/*.png/
+**/*.upload-checksum
diff --git a/upload.sh b/upload.sh
index e6cd5db..e1ae128 100755
--- a/upload.sh
+++ b/upload.sh
@@ -1,12 +1,15 @@
 #!/usr/bin/bash
 
-# todo: Create local cache containing file timestamps that were previously uploaded.
-
 for cur in ./html/{*,*/*,*/*/*}; do
-  if [[ "$cur" == *"/tracks/"* ]]; then
-    continue
-  fi
-  if [ -f "$cur" ]; then
+  if [ -f "$cur" ] && [[ ! "$cur" == *.upload-checksum ]]; then
+    if [ -f "$cur.upload-checksum" ]; then
+      c=$(cat "$cur.upload-checksum" | sha256sum -c 2> /dev/null)
+      if [[ "$c" == *OK ]]; then
+        echo "$cur is up-to-date, skipping"
+        continue
+      fi
+    fi
+    echo $(sha256sum "$cur") > "$cur.upload-checksum"
     d=$(dirname $(realpath --relative-to="./html" "$cur"))
     if [[ "$d" == "." ]]; then
       neocities upload $cur