feat: new backup transfer method

.github/workflows/ci.yml

@@ -40,6 +40,11 @@ jobs:
             toolchain: stable
             components: clippy
             override: true
+      - name: Install Protoc
+        uses: arduino/setup-protoc@v1
+        with:
+          version: '3.20.1'
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
       - name: Cache rust cargo artifacts
         uses: swatinem/rust-cache@v1
       - uses: actions-rs/clippy-check@v1
@@ -55,6 +60,11 @@ jobs:
     steps:
       - name: Checkout sources
         uses: actions/checkout@v2
+      - name: Install Protoc
+        uses: arduino/setup-protoc@v1
+        with:
+          version: '3.20.1'
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
       - name: Install rust stable toolchain
         uses: actions-rs/toolchain@v1
         with:
@@ -77,24 +87,28 @@ jobs:
         include:
           # Currently used Rust version, same as in `rust-toolchain` file.
           - os: ubuntu-latest
-            rust: 1.61.0
+            rust: 1.63.0
             python: 3.9
           - os: windows-latest
-            rust: 1.61.0
+            rust: 1.63.0
             python: false # Python bindings compilation on Windows is not supported.
 
-          # Minimum Supported Rust Version = 1.57.0
+          # Minimum Supported Rust Version = 1.63.0
           #
           # Minimum Supported Python Version = 3.7
           # This is the minimum version for which manylinux Python wheels are
           # built.
           - os: ubuntu-latest
-            rust: 1.57.0
+            rust: 1.63.0
             python: 3.7
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@master
-
+    - name: Install Protoc
+      uses: arduino/setup-protoc@v1
+      with:
+        version: '3.20.1'
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
     - name: Install ${{ matrix.rust }}
       uses: actions-rs/toolchain@v1
       with:

.github/workflows/jsonrpc.yml

@@ -26,6 +26,11 @@ jobs:
           override: true
       - name: Add Rust cache
         uses: Swatinem/rust-cache@v1.3.0
+      - name: Install Protoc
+        uses: arduino/setup-protoc@v1
+        with:
+          version: '3.20.1'
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
       - name: npm install
         run: |
           cd deltachat-jsonrpc/typescript

.github/workflows/node-package.yml

@@ -27,7 +27,11 @@ jobs:
           cargo -vV
           npm --version
           node --version
-
+      - name: Install Protoc
+        uses: arduino/setup-protoc@v1
+        with:
+          version: '3.20.1'
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
       - name: Cache node modules
         uses: actions/cache@v2
         with:

.github/workflows/node-tests.yml

@@ -27,7 +27,11 @@ jobs:
           cargo -vV
           npm --version
           node --version
-
+      - name: Install Protoc
+        uses: arduino/setup-protoc@v1
+        with:
+          version: '3.20.1'
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
       - name: Cache node modules
         uses: actions/cache@v2
         with: