diff --git a/.github/workflows/android.yml b/.github/workflows/android.yml
index a05eb55871..5f9f738b11 100644
--- a/.github/workflows/android.yml
+++ b/.github/workflows/android.yml
@@ -34,6 +34,16 @@ jobs:
           path: 3rdParty/buildCache
           key: android-${{ matrix.type }}-${{ hashFiles('android/*.sh') }}
 
+      - name: Configure Python
+        if: ${{ success() && contains(matrix.type, 'vcpkg') }}
+        run: |
+          pip install boto3
+
+      - name: Download vcpkg binary cache
+        if: ${{ success() && contains(matrix.type, 'vcpkg') }}
+        run: |
+          python ./deploy/manage_vcpkg_archive_cache.py download 3rdParty/buildCache/android/vcpkgcache/vcpkg/archives/ android "edu.berkeley.boinc.github.actions.build.vcpkg.binary.cache"
+
       - name: Build manager
         if: ${{ success() && matrix.type == 'manager' }}
         run:  |
@@ -92,3 +102,12 @@ jobs:
         with:
           fail_ci_if_error: true
           verbose: false
+
+      - name: Upload vcpkg binary cache
+        if: ${{ success() && contains(matrix.type, 'vcpkg') }}
+        env:
+          BUCKET: ${{ secrets.S3_BUCKET }}
+          ACCESS_KEY: ${{ secrets.S3_ACCESS_KEY }}
+          SECRET_KEY: ${{ secrets.S3_SECRET_KEY }}
+        run: |
+          python ./deploy/manage_vcpkg_archive_cache.py upload 3rdParty/buildCache/android/vcpkgcache/vcpkg/archives/ android "edu.berkeley.boinc.github.actions.build.vcpkg.binary.cache" "$ACCESS_KEY" "$SECRET_KEY"
diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index d2d599d3d6..28c1e1b6f4 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -40,6 +40,16 @@ jobs:
           key: linux-${{ matrix.type }}-${{ hashFiles('3rdParty/*Linux*.sh', 'linux/*.sh') }}
           restore-keys: linux-${{ matrix.type }}-
 
+      - name: Configure Python
+        if: ${{ success() && contains(matrix.type, 'vcpkg') }}
+        run: |
+          pip install boto3
+
+      - name: Download vcpkg binary cache
+        if: ${{ success() && contains(matrix.type, 'vcpkg') }}
+        run: |
+          python ./deploy/manage_vcpkg_archive_cache.py download 3rdParty/buildCache/linux/vcpkgcache/vcpkg/archives/ linux "edu.berkeley.boinc.github.actions.build.vcpkg.binary.cache"
+
       - name: Automake
         if: success()
         run: ./_autosetup
@@ -129,3 +139,12 @@ jobs:
         with:
           fail_ci_if_error: true
           verbose: false
+
+      - name: Upload vcpkg binary cache
+        if: ${{ success() && contains(matrix.type, 'vcpkg') }}
+        env:
+          BUCKET: ${{ secrets.S3_BUCKET }}
+          ACCESS_KEY: ${{ secrets.S3_ACCESS_KEY }}
+          SECRET_KEY: ${{ secrets.S3_SECRET_KEY }}
+        run: |
+          python ./deploy/manage_vcpkg_archive_cache.py upload 3rdParty/buildCache/linux/vcpkgcache/vcpkg/archives/ linux "edu.berkeley.boinc.github.actions.build.vcpkg.binary.cache" "$ACCESS_KEY" "$SECRET_KEY"          
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index d227348c07..9be4d1e43c 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -51,6 +51,18 @@ jobs:
           key: windows-${{ matrix.platform }}-${{ matrix.configuration }}-${{ hashFiles('win_build/vcpkg_3rdparty_dependencies_vs2019.vcxproj') }}
           restore-keys: windows-${{ matrix.platform }}-${{ matrix.configuration }}-
 
+      - name: Configure Python
+        if: ${{ success() }}
+        shell: cmd
+        run: |
+          pip install boto3
+
+      - name: Download vcpkg binary cache
+        if: ${{ success() }}
+        shell: cmd
+        run: |
+          python deploy\manage_vcpkg_archive_cache.py download ${{ github.workspace }}\3rdParty\buildCache\windows\vcpkgcache\ windows "edu.berkeley.boinc.github.actions.build.vcpkg.binary.cache"
+
       - name: Build
         run: msbuild win_build\boinc_vs2019.sln -p:Configuration=${{ matrix.configuration }} -p:Platform=${{ matrix.platform }} -p:VcpkgTripletConfig=ci -m
 
@@ -100,3 +112,13 @@ jobs:
         with:
           fail_ci_if_error: true
           verbose: false
+
+      - name: Upload vcpkg binary cache
+        if: ${{ success() }}
+        shell: cmd
+        env:
+          BUCKET: ${{ secrets.S3_BUCKET }}
+          ACCESS_KEY: ${{ secrets.S3_ACCESS_KEY }}
+          SECRET_KEY: ${{ secrets.S3_SECRET_KEY }}
+        run: |
+          python deploy\manage_vcpkg_archive_cache.py upload ${{ github.workspace }}\3rdParty\buildCache\windows\vcpkgcache\ windows "edu.berkeley.boinc.github.actions.build.vcpkg.binary.cache" "%ACCESS_KEY%" "%SECRET_KEY%"          
diff --git a/deploy/manage_vcpkg_archive_cache.py b/deploy/manage_vcpkg_archive_cache.py
new file mode 100644
index 0000000000..c583566223
--- /dev/null
+++ b/deploy/manage_vcpkg_archive_cache.py
@@ -0,0 +1,97 @@
+import boto3
+import os
+import sys
+from botocore import UNSIGNED
+from botocore.client import Config
+from botocore.exceptions import NoCredentialsError
+
+def s3_upload(local_file, s3_file, bucket, access_key, secret_key):
+    print('Uploading', local_file, '->', s3_file)
+
+    s3 = boto3.client('s3', aws_access_key_id=access_key,
+                      aws_secret_access_key=secret_key)
+
+    try:
+        s3.upload_file(local_file, bucket, s3_file)
+        print("Upload Successful")
+    except FileNotFoundError:
+        print("The file was not found")
+    except NoCredentialsError:
+        print("Credentials not available")
+
+def s3_download(local_file, s3_file, bucket):
+    print('Downloading', s3_file, '->', local_file)
+    s3 = boto3.client('s3', config=Config(signature_version=UNSIGNED))
+
+    try:
+        s3.download_file(bucket, s3_file, local_file)
+        print("Download Successful")
+        return True
+    except NoCredentialsError:
+        print("Credentials not available")
+        return False
+
+def s3_list(bucket):
+    s3 = boto3.client('s3', config=Config(signature_version=UNSIGNED))
+
+    try:
+        return s3.list_objects(Bucket=bucket)['Contents']
+    except Exception:
+        print("Failed to retrieve list of files in bucket")
+        return None
+
+def upload(os_name, dir, bucket, access_key, secret_key):
+    l = s3_list(bucket)
+    for path, _, files in os.walk(dir):
+        for name in files:
+            found = False
+            file_path = os.path.join(path, name)
+            dir_name = os.path.basename(path)
+            file_name = os_name + '-' + dir_name + '-' + name
+            if (l is not None):
+                for k in l:
+                    key = k['Key']
+                    if (key == file_name):
+                        found = True
+                        break
+            if (not found):
+                s3_upload(file_path, file_name, bucket, access_key, secret_key)
+
+def download(os_name, dir, bucket):
+    l = s3_list(bucket)
+    if (l is not None):
+        for k in l:
+            key = k['Key']
+            a = key.split('-')
+            if (len(a) == 3 and a[0] == os_name):
+                os.makedirs(os.path.join(dir, a[1]), exist_ok=True)
+                local_file = os.path.join(dir, a[1], a[2])
+                if (os.path.isfile(local_file)):
+                    print('Found local file', local_file)
+                    continue
+                s3_download(local_file, key, bucket)
+
+def help():
+    print('Usage:')
+    print('python manage_vcpkg_archive_cache.py <action> <dir> <os> <bucket> <access_key> <secret_key>')
+
+if (len(sys.argv) != 7 and len(sys.argv) != 5):
+    help()
+    sys.exit(1)
+
+action_name = sys.argv[1]
+dir_name = sys.argv[2]
+os_name = sys.argv[3]
+bucket_name = sys.argv[4]
+
+if (action_name == 'upload' and len(sys.argv) == 7):
+    access_key = sys.argv[5]
+    secret_key = sys.argv[6]
+    upload(os_name, dir_name, bucket_name, access_key, secret_key)
+elif (action_name == 'download'):
+    download(os_name, dir_name, bucket_name)
+else:
+    help()
+    sys.exit(1)
+
+sys.exit(0)