diff --git a/package.json b/package.json
index 8870fea..d04ffdc 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
     "build-only": "vite build",
     "type-check": "vue-tsc --build",
     "format": "prettier --write --experimental-cli src/",
-    "fetch-wasm": "curl -L -o src/assets/core.wasm https://github.com/git-calendar/core/releases/download/v0.1.1/core.wasm",
+    "fetch-wasm": "curl -L -o src/assets/core.wasm https://github.com/git-calendar/core/releases/download/v0.1.2/core.wasm",
     "fetch-wasm-latest": "curl -L -o src/assets/core.wasm https://github.com/git-calendar/core/releases/latest/download/core.wasm"
   },
   "dependencies": {
diff --git a/src/components/SideBar.vue b/src/components/SideBar.vue
index cdaae3c..60ecb33 100644
--- a/src/components/SideBar.vue
+++ b/src/components/SideBar.vue
@@ -4,6 +4,8 @@ import { useSlots } from 'vue';
 import SidebarCloseBtn from '@/components/SidebarCloseBtn.vue';
 import { useSidebar } from '@/composables/useSidebar';
 import NewEventBtn from '@/components/NewEventBtn.vue';
+import { exportZip } from '@/utils';
+import { LuFolderArchive } from 'vue-icons-plus/lu';
 
 const slots = useSlots();
 const sidebar = useSidebar();
@@ -29,6 +31,9 @@ const sidebar = useSidebar();
       <router-link to="/settings">
         <FiSettings />
       </router-link>
+      <button type="button" @click="exportZip('')">
+        <LuFolderArchive style="transform: scale(1.1)" />
+      </button>
       <a href="https://github.com/git-calendar/web-client" target="_blank">
         <FiGithub style="position: relative; left: -2%; top: 2%" />
       </a>
@@ -63,6 +68,7 @@ aside {
     padding: 0.3rem;
     width: 2.1rem;
     aspect-ratio: 1/1;
+    background-color: transparent;
 
     border-radius: var(--small-border-radius);
 
diff --git a/src/types/core.ts b/src/types/core.ts
index f7de11b..4ca787f 100644
--- a/src/types/core.ts
+++ b/src/types/core.ts
@@ -32,6 +32,7 @@ export interface CalendarApi {
 
   pullAll(): void;
   pushAll(): void;
+  exportZip(calendar: string): ArrayBuffer;
 
   createEvent(event: CalendarEvent): CalendarEvent;
   updateEvent(event: CalendarEvent): CalendarEvent;
diff --git a/src/utils.ts b/src/utils.ts
index 81c31db..796f5e5 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -2,6 +2,7 @@ import { DateTime } from 'luxon';
 import { type RouteParamsGeneric, type Router } from 'vue-router';
 import { useSettings } from '@/composables/useSettings';
 import type { CalendarEvent } from './types/core';
+import { CalendarCore } from './wasm/core-wrapper';
 
 const { settings } = useSettings();
 
@@ -122,3 +123,42 @@ export function timeInPercentOnTimeline(datetime: DateTime): number {
 export function isWholeDay(event: CalendarEvent): boolean {
   return event.from.toFormat('HH:mm') == '00:00' && event.to.toFormat('HH:mm') == '23:59';
 }
+
+/**
+ * Downloads a zipped calendar or all calendars if ''.
+ */
+export async function exportZip(calendar: string = '') {
+  const zipBytes = await CalendarCore.exportZip(calendar);
+  const fileName = calendar ? `${calendar}.zip` : `git-calendar-data.zip`;
+
+  if ('showSaveFilePicker' in window && typeof window.showSaveFilePicker == 'function') {
+    const handle = await window.showSaveFilePicker({
+      suggestedName: fileName,
+      types: [
+        {
+          description: 'ZIP archive',
+          accept: { 'application/zip': ['.zip'] },
+        },
+      ],
+    });
+
+    const writable = await handle.createWritable();
+    await writable.write(zipBytes);
+    await writable.close();
+  } else {
+    // firefox doesnt have the showSaveFilePicker method
+    downloadBlob(zipBytes, fileName);
+  }
+}
+
+function downloadBlob(data: BlobPart, filename: string) {
+  const blob = new Blob([data], { type: 'application/zip' });
+  const url = URL.createObjectURL(blob);
+
+  const a = document.createElement('a');
+  a.href = url;
+  a.download = filename;
+  a.click();
+
+  URL.revokeObjectURL(url);
+}
diff --git a/src/wasm/mapper.ts b/src/wasm/mapper.ts
index 4a5cb0e..a530761 100644
--- a/src/wasm/mapper.ts
+++ b/src/wasm/mapper.ts
@@ -21,9 +21,25 @@ function toSnakeCase(str: string): string {
 //
 // So this hydrateDates tries to parse it beforehand.
 export function hydrateDates<T>(data: unknown): T {
-  // non-object, primitive, null
+  // primitives / null
   if (data === null || typeof data !== 'object') return data as T;
 
+  // preserve binary data
+  if (
+    data instanceof Uint8Array ||
+    data instanceof ArrayBuffer ||
+    ArrayBuffer.isView(data) ||
+    data instanceof Blob ||
+    data instanceof File
+  ) {
+    return data as T;
+  }
+
+  // preserve Luxon values if they ever come through here
+  if (DateTime.isDateTime(data)) {
+    return data as T;
+  }
+
   if (Array.isArray(data)) {
     return data.map(hydrateDates) as unknown as T; // recursively for arrays
   }
@@ -44,10 +60,8 @@ export function hydrateDates<T>(data: unknown): T {
       } else {
         result[key] = dt;
       }
-    } else if (value && typeof value === 'object' && !Array.isArray(value)) {
-      result[key] = hydrateDates(value); // recursively for objects
     } else {
-      result[key] = value; // just assign
+      result[key] = hydrateDates(value); // recursively
     }
   }