diff --git a/.github/workflows/build-machines-and-homes.yml b/.github/workflows/build-machines-and-homes.yml
index 7e25ec2..3b36789 100644
--- a/.github/workflows/build-machines-and-homes.yml
+++ b/.github/workflows/build-machines-and-homes.yml
@@ -54,8 +54,7 @@ jobs:
       - name: cache
         if: always()
         run: |
-          nix copy --all --to 's3://nixcache?endpoint=s3.cy7.sh' --verbose
-          nix store sign --store 's3://nixcache?endpoint=s3.cy7.sh' -k /home/runner/cache-priv-key.pem --all
+          nix copy ".#nixosConfigurations."${{ matrix.machine }}".config.system.build.toplevel" --to "s3://nixcache?endpoint=s3.cy7.sh&secret-key=/home/runner/cache-priv-key.pem"
   build-homes:
     strategy:
       fail-fast: false
@@ -94,5 +93,4 @@ jobs:
       - name: cache
         if: always()
         run: |
-          nix copy --all --to 's3://nixcache?endpoint=s3.cy7.sh' --verbose
-          nix store sign --store 's3://nixcache?endpoint=s3.cy7.sh' -k /home/runner/cache-priv-key.pem --all
+          nix copy ".#homeConfigurations."${{ matrix.home }}".activationPackage" --to "s3://nixcache?endpoint=s3.cy7.sh&secret-key=/home/runner/cache-priv-key.pem"
diff --git a/.github/workflows/build-packages.yml b/.github/workflows/build-packages.yml
index 5e779ac..3411c89 100644
--- a/.github/workflows/build-packages.yml
+++ b/.github/workflows/build-packages.yml
@@ -16,8 +16,6 @@ env:
     extra-substituters = https://nixcache.cy7.sh
     extra-trusted-public-keys = nixcache.cy7.sh:DN3d1dt0wnXfTH03oVmTee4KgmdNdB0NY3SuzA8Fwx8=
   TERM: ansi
-  AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
-  AWS_SECRET_ACCESS_KEY: ${{ secrets. AWS_SECRET_ACCESS_KEY }}
 jobs:
   build-packages:
     strategy:
@@ -44,8 +42,7 @@ jobs:
       - name: cache result
         if: always()
         run: |
-          nix copy --all --to 's3://nixcache?endpoint=s3.cy7.sh' --verbose
-          nix store sign --store 's3://nixcache?endpoint=s3.cy7.sh' -k /home/runner/cache-priv-key.pem --all
+          nix copy "${{ matrix.package }}" --to "s3://nixcache?endpoint=s3.cy7.sh&secret-key=/home/runner/cache-priv-key.pem"
       - name: prepare tarball to upload
         run: nix run github:nixos/nixpkgs#gnutar hcvf result.tar result
       - name: upload result
diff --git a/hosts/chunk/default.nix b/hosts/chunk/default.nix
index 22290c1..f016a84 100644
--- a/hosts/chunk/default.nix
+++ b/hosts/chunk/default.nix
@@ -190,4 +190,6 @@
 
   # container stuff
   my.containerization.enable = true;
+
+  my.attic.enable = true;
 }
diff --git a/hosts/chunk/rclone.nix b/hosts/chunk/rclone.nix
index c592fbb..803a188 100644
--- a/hosts/chunk/rclone.nix
+++ b/hosts/chunk/rclone.nix
@@ -14,7 +14,7 @@ let
         --config ${config.sops.secrets."rclone/config".path} \
         --allow-other \
         --cache-dir /var/cache/rclone \
-        --transfers 32 \
+        --transfers 16 \
         --vfs-cache-mode full \
         --vfs-cache-min-free-space 5G \
         --dir-cache-time 30d \