diff --git a/.github/workflows/mirror.yml b/.github/workflows/mirror.yml
new file mode 100644
index 0000000..ae79b63
--- /dev/null
+++ b/.github/workflows/mirror.yml
@@ -0,0 +1,51 @@
+name: update mirror
+
+permissions:
+  contents: read
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+  schedule:
+    - cron: "0 0,6,12,18 * * *"
+
+jobs:
+  generate:
+    name: Generate backend files
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v5
+        with:
+          persist-credentials: false
+
+      - name: Install rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Generate backend files
+        run: |
+          mkdir tmp/
+          cargo run --locked --release --bin upki-mirror -- tmp/ production --manifest-comment="$GITHUB_REPOSITORY run $GITHUB_RUN_ID"
+
+      - name: Package and upload artifact
+        uses: actions/upload-pages-artifact@v4
+        with:
+          path: ./tmp/
+
+  deploy:
+    name: Deploy
+    runs-on: ubuntu-latest
+    if: github.repository == 'rustls/upki' && github.ref == 'refs/heads/main'
+    needs: generate
+    permissions:
+      pages: write
+      id-token: write
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4
diff --git a/Cargo.lock b/Cargo.lock
index 0ebdfba..8be218e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,10 +2,1620 @@
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+ "yoke",
+ "zerofrom",
+ "zerovec-derive",
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diff --git a/Cargo.toml b/Cargo.toml
index 6f0d4ae..0b48963 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,6 +5,17 @@ resolver = "3"
 [workspace.package]
 rust-version = "1.85"
 edition = "2024"
+repository = "https://github.com/rustls/upki"
+
+[workspace.dependencies]
+clap = { version = "4.5", features = ["derive"] }
+eyre = "0.6"
+hex = { version = "0.4", features = ["serde"] }
+reqwest = { version = "0.12", default-features = false, features = ["charset", "h2", "http2", "json", "rustls-tls"] }
+ring = "0.17"
+serde = "1"
+serde_json = "1"
+tokio = { version = "1.47", features = ["io-util", "macros", "net", "rt"] }
 
 [workspace.lints.clippy]
 alloc_instead_of_core = "warn"
diff --git a/rustls-upki/Cargo.toml b/rustls-upki/Cargo.toml
index 21860c4..062259d 100644
--- a/rustls-upki/Cargo.toml
+++ b/rustls-upki/Cargo.toml
@@ -2,6 +2,7 @@
 name = "rustls-upki"
 version = "0.1.0"
 edition.workspace = true
+repository.workspace = true
 rust-version.workspace = true
 
 [dependencies]
diff --git a/upki-mirror/Cargo.toml b/upki-mirror/Cargo.toml
index 43a3882..59dfa98 100644
--- a/upki-mirror/Cargo.toml
+++ b/upki-mirror/Cargo.toml
@@ -3,8 +3,17 @@ name = "upki-mirror"
 version = "0.1.0"
 edition.workspace = true
 rust-version.workspace = true
+repository.workspace = true
 
 [dependencies]
+clap.workspace = true
+eyre.workspace = true
+hex.workspace = true
+reqwest.workspace = true
+ring.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+tokio.workspace = true
 
 [lints]
 workspace = true
diff --git a/upki-mirror/src/main.rs b/upki-mirror/src/main.rs
index e7a11a9..1d74e86 100644
--- a/upki-mirror/src/main.rs
+++ b/upki-mirror/src/main.rs
@@ -1,3 +1,198 @@
-fn main() {
-    println!("Hello, world!");
+use core::time::Duration;
+use std::collections::HashMap;
+use std::fs;
+use std::path::PathBuf;
+use std::time::SystemTime;
+
+use clap::{Parser, ValueEnum};
+use eyre::{Context, Report, anyhow};
+use ring::digest::{SHA256, digest};
+use serde::Serialize;
+mod mozilla;
+
+#[tokio::main(flavor = "current_thread")]
+async fn main() -> Result<(), Report> {
+    let opts = Opts::try_parse()?;
+    let source = Source::from(opts.mozilla_backend);
+
+    let client = reqwest::Client::builder()
+        .use_rustls_tls()
+        .timeout(Duration::from_secs(opts.http_timeout_secs))
+        .user_agent(format!(
+            "{} v{} ({})",
+            env!("CARGO_PKG_NAME"),
+            env!("CARGO_PKG_VERSION"),
+            env!("CARGO_PKG_REPOSITORY")
+        ))
+        .build()
+        .wrap_err("failed to create HTTP client")?;
+
+    let response = client
+        .get(source.records_url)
+        .send()
+        .await
+        .wrap_err("records request failed")?;
+
+    if !response.status().is_success() {
+        return Err(anyhow!(
+            "HTTP error for records request: {}",
+            response.status()
+        ));
+    }
+
+    let incoming_manifest = response
+        .json::<mozilla::Manifest>()
+        .await
+        .wrap_err("failed to parse records JSON")?;
+
+    let by_parent: HashMap<String, &mozilla::Item> = HashMap::from_iter(
+        incoming_manifest
+            .data
+            .iter()
+            .filter_map(|it| Some((it.parent.as_ref()?.clone(), it))),
+    );
+
+    // Walk the DAG of filters, starting from the root full filter.
+    let mut next = incoming_manifest
+        .data
+        .iter()
+        .find(|it| {
+            !it.incremental && it.parent.is_none() && it.channel == mozilla::Channel::Default
+        });
+
+    let mut download_plan = Vec::new();
+
+    while let Some(item) = next {
+        next = by_parent.get(&item.id).copied();
+        download_plan.push(item);
+    }
+
+    let mut filters = Vec::new();
+
+    for p in download_plan {
+        let attachment_url = source.attachment_host.to_string() + &p.attachment.location;
+        let response = client
+            .get(&attachment_url)
+            .send()
+            .await
+            .wrap_err_with(|| format!("download request failed for {attachment_url}"))?;
+        let bytes = response.bytes().await?;
+
+        // check hash matches
+        let actual_hash = digest(&SHA256, &bytes);
+        if p.attachment.hash != actual_hash.as_ref() {
+            return Err(anyhow!(
+                "item {p:?} downloaded from {attachment_url:?} does not have correct hash"
+            ));
+        }
+
+        // and size (impossible if hash is correct, but should make us distrust the data)
+        if p.attachment.size != bytes.len() {
+            return Err(anyhow!(
+                "item {p:?} downloaded from {attachment_url:?} does not have correct size"
+            ));
+        }
+
+        let output_filename = opts
+            .output_dir
+            .join(&p.attachment.filename);
+        fs::write(&output_filename, bytes)
+            .wrap_err_with(|| format!("cannot write filter data to {output_filename:?}",))?;
+
+        filters.push(Filter {
+            filename: p.attachment.filename.clone(),
+            size: p.attachment.size,
+            hash: p.attachment.hash.clone(),
+        });
+    }
+
+    let manifest = Manifest {
+        generated_at: SystemTime::now()
+            .duration_since(SystemTime::UNIX_EPOCH)
+            .unwrap()
+            .as_secs(),
+        comment: opts.manifest_comment.clone(),
+        filters,
+    };
+    let output_filename = opts.output_dir.join("manifest.json");
+    fs::write(
+        output_filename,
+        serde_json::to_string(&manifest)
+            .wrap_err("cannot encode JSON manifest")?
+            .as_bytes(),
+    )
+    .wrap_err_with(|| "cannot write manifest to {output_filename:?}")?;
+
+    Ok(())
 }
+
+#[derive(Debug, Parser)]
+struct Opts {
+    /// Where to write output files.  This must exist.
+    output_dir: PathBuf,
+
+    /// Which Mozilla settings backend to fetch from.
+    #[clap(default_value_t = MozillaBackend::Production)]
+    #[arg(value_enum)]
+    mozilla_backend: MozillaBackend,
+
+    /// Timeout in seconds for all HTTP requests.
+    #[clap(long, default_value_t = 10)]
+    http_timeout_secs: u64,
+
+    /// Comment included in output manifest.
+    #[clap(long, default_value = "")]
+    manifest_comment: String,
+}
+
+#[derive(Clone, Debug, Serialize)]
+struct Manifest {
+    /// When this file was generated.
+    ///
+    /// UNIX timestamp in seconds.
+    generated_at: u64,
+
+    /// Some human-readable text.
+    comment: String,
+
+    /// List of filter files.
+    filters: Vec<Filter>,
+}
+
+#[derive(Clone, Debug, Serialize)]
+struct Filter {
+    /// Relative filename.
+    ///
+    /// This is also the suggested local filename.
+    filename: String,
+
+    /// File size, indicative.  Allows a fetcher to predict data usage.
+    size: usize,
+
+    /// SHA256 hash of file contents.
+    #[serde(with = "hex::serde")]
+    hash: Vec<u8>,
+}
+
+#[derive(Clone, Copy, Debug, ValueEnum)]
+enum MozillaBackend {
+    Production,
+}
+
+struct Source {
+    records_url: &'static str,
+    attachment_host: &'static str,
+}
+
+impl From<MozillaBackend> for Source {
+    fn from(value: MozillaBackend) -> Self {
+        match value {
+            MozillaBackend::Production => MOZILLA_PROD,
+        }
+    }
+}
+
+const MOZILLA_PROD: Source = Source {
+    records_url: "https://firefox.settings.services.mozilla.com/v1/buckets/security-state/collections/cert-revocations/records",
+    attachment_host: "https://firefox-settings-attachments.cdn.mozilla.net/",
+};
diff --git a/upki-mirror/src/mozilla.rs b/upki-mirror/src/mozilla.rs
new file mode 100644
index 0000000..a05ccdc
--- /dev/null
+++ b/upki-mirror/src/mozilla.rs
@@ -0,0 +1,33 @@
+//! JSON structures used in the Mozilla preferences service.
+
+use serde::Deserialize;
+
+#[derive(Debug, Deserialize)]
+pub(crate) struct Manifest {
+    pub(crate) data: Vec<Item>,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+pub(crate) struct Item {
+    pub(crate) attachment: Attachment,
+    pub(crate) channel: Channel,
+    pub(crate) id: String,
+    pub(crate) incremental: bool,
+    pub(crate) parent: Option<String>,
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq)]
+#[serde(rename_all = "snake_case")]
+pub(crate) enum Channel {
+    Default,
+    Compat,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+pub(crate) struct Attachment {
+    #[serde(with = "hex::serde")]
+    pub hash: Vec<u8>,
+    pub size: usize,
+    pub filename: String,
+    pub location: String,
+}