diff --git a/src/downloader/local.rs b/src/downloader/local.rs
index 6536aa7..f946a2e 100644
--- a/src/downloader/local.rs
+++ b/src/downloader/local.rs
@@ -1,9 +1,5 @@
 use anyhow::{Context, Result, bail};
-use std::{
-    fs,
-    path::{Path, PathBuf},
-    process::Command,
-};
+use std::{path::Path, process::Command};
 
 use crate::hash::hash_file;
 
@@ -30,71 +26,3 @@ pub fn save(path: String, store_path: &Path, timestamp: &String) -> Result<Strin
 
     hash_file(&out_file)
 }
-
-/// Moves `file` into the content-addressed raw store under `store_path`.
-///
-/// The destination path is derived from the file's SHA-256 hash:
-/// `raw/<first-char>/<second-char>/<hash><ext>`. If the destination already
-/// exists the source file is removed (deduplication); otherwise it is renamed.
-/// Returns the store-relative destination path.
-pub fn archive_staged_file(file: &Path, store_path: &Path) -> Result<PathBuf> {
-    let hash = hash_file(file)?;
-    let destination = raw_relative_path(file, &hash)?;
-    let absolute_destination = store_path.join(&destination);
-
-    if let Some(parent) = absolute_destination.parent() {
-        fs::create_dir_all(parent)?;
-    }
-
-    if absolute_destination.exists() {
-        fs::remove_file(file)?;
-    } else {
-        fs::rename(file, &absolute_destination)?;
-    }
-
-    Ok(destination)
-}
-
-/// Computes the store-relative path for a file given its `hash`.
-/// The layout is `raw/<c1>/<c2>/<hash><ext>` where `c1`/`c2` are the first
-/// two characters of the hash, providing a two-level directory sharding.
-fn raw_relative_path(file: &Path, hash: &str) -> Result<PathBuf> {
-    let mut chars = hash.chars();
-    let first_letter = chars.next().context("hash must not be empty")?;
-    let second_letter = chars
-        .next()
-        .context("hash must be at least two characters")?;
-    let extension = file
-        .extension()
-        .map_or(String::new(), |ext| format!(".{}", ext.to_string_lossy()));
-
-    Ok(PathBuf::from("raw")
-        .join(first_letter.to_string())
-        .join(second_letter.to_string())
-        .join(format!("{hash}{extension}")))
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use std::{env, fs};
-
-    #[test]
-    fn test_archive_staged_file_moves_into_raw_store() {
-        let root = env::temp_dir().join(format!("archivr-local-test-{}", std::process::id()));
-        let _ = fs::remove_dir_all(&root);
-        fs::create_dir_all(root.join("temp")).unwrap();
-
-        let staged = root.join("temp").join("photo.jpg");
-        fs::write(&staged, b"image-bytes").unwrap();
-
-        let relative = archive_staged_file(&staged, &root).unwrap();
-        let absolute = root.join(&relative);
-
-        assert!(absolute.is_file());
-        assert!(!staged.exists());
-        assert!(relative.starts_with("raw"));
-
-        let _ = fs::remove_dir_all(&root);
-    }
-}
diff --git a/src/downloader/mod.rs b/src/downloader/mod.rs
index 0811854..de5d604 100644
--- a/src/downloader/mod.rs
+++ b/src/downloader/mod.rs
@@ -1,3 +1,4 @@
 pub mod local;
+pub mod store;
 pub mod tweets;
 pub mod ytdlp;
diff --git a/src/downloader/store.rs b/src/downloader/store.rs
new file mode 100644
index 0000000..f83d428
--- /dev/null
+++ b/src/downloader/store.rs
@@ -0,0 +1,75 @@
+use anyhow::{Context, Result};
+use std::{
+    fs,
+    path::{Path, PathBuf},
+};
+
+use crate::hash::hash_file;
+
+/// Moves `file` into the content-addressed raw store under `store_path`.
+///
+/// The destination path is derived from the file's SHA-256 hash:
+/// `raw/<first-char>/<second-char>/<hash><ext>`. If the destination already
+/// exists the source file is removed (deduplication); otherwise it is renamed.
+/// Returns the store-relative destination path.
+pub fn archive_staged_file(file: &Path, store_path: &Path) -> Result<PathBuf> {
+    let hash = hash_file(file)?;
+    let destination = raw_relative_path(file, &hash)?;
+    let absolute_destination = store_path.join(&destination);
+
+    if let Some(parent) = absolute_destination.parent() {
+        fs::create_dir_all(parent)?;
+    }
+
+    if absolute_destination.exists() {
+        fs::remove_file(file)?;
+    } else {
+        fs::rename(file, &absolute_destination)?;
+    }
+
+    Ok(destination)
+}
+
+/// Computes the store-relative path for a file given its `hash`.
+/// The layout is `raw/<c1>/<c2>/<hash><ext>` where `c1`/`c2` are the first
+/// two characters of the hash, providing a two-level Trie.
+fn raw_relative_path(file: &Path, hash: &str) -> Result<PathBuf> {
+    let mut chars = hash.chars();
+    let first_letter = chars.next().context("hash must not be empty")?;
+    let second_letter = chars
+        .next()
+        .context("hash must be at least two characters")?;
+    let extension = file
+        .extension()
+        .map_or(String::new(), |ext| format!(".{}", ext.to_string_lossy()));
+
+    Ok(PathBuf::from("raw")
+        .join(first_letter.to_string())
+        .join(second_letter.to_string())
+        .join(format!("{hash}{extension}")))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::{env, fs};
+
+    #[test]
+    fn test_archive_staged_file_moves_into_raw_store() {
+        let root = env::temp_dir().join(format!("archivr-store-test-{}", std::process::id()));
+        let _ = fs::remove_dir_all(&root);
+        fs::create_dir_all(root.join("temp")).unwrap();
+
+        let staged = root.join("temp").join("photo.jpg");
+        fs::write(&staged, b"image-bytes").unwrap();
+
+        let relative = archive_staged_file(&staged, &root).unwrap();
+        let absolute = root.join(&relative);
+
+        assert!(absolute.is_file());
+        assert!(!staged.exists());
+        assert!(relative.starts_with("raw"));
+
+        let _ = fs::remove_dir_all(&root);
+    }
+}
diff --git a/src/downloader/tweets.rs b/src/downloader/tweets.rs
index 57014f2..1e66063 100644
--- a/src/downloader/tweets.rs
+++ b/src/downloader/tweets.rs
@@ -10,16 +10,9 @@ use std::{
     sync::OnceLock,
 };
 
-use super::local;
+use crate::twitter::parse_tweet_id;
 
-/// Returns `Some(id)` if `id` is a non-empty string of ASCII digits, otherwise `None`.
-fn parse_tweet_id(id: &str) -> Option<String> {
-    if !id.is_empty() && id.chars().all(|char| char.is_ascii_digit()) {
-        Some(id.to_string())
-    } else {
-        None
-    }
-}
+use super::store;
 
 /// Extracts a tweet ID from an archivr path like `"tweet:123"` by taking the
 /// last colon-separated segment and validating it as a numeric ID.
@@ -303,7 +296,7 @@ fn archive_asset_reference(
         );
     }
 
-    let relative_path = local::archive_staged_file(&absolute_path, store_path)?;
+    let relative_path = store::archive_staged_file(&absolute_path, store_path)?;
     let relative_path = relative_path.to_string_lossy().replace('\\', "/");
     archived_assets.insert(key, relative_path.clone());
 
diff --git a/src/main.rs b/src/main.rs
index 4bc6e35..177194b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -9,6 +9,7 @@ use std::{
 
 mod downloader;
 mod hash;
+mod twitter;
 
 #[derive(Parser, Debug)]
 #[command(version, about, long_about = None)]
@@ -83,17 +84,8 @@ enum Source {
     Other,
 }
 
-/// Returns the tweet ID when `id` is non-empty and contains only ASCII digits.
-fn parse_tweet_id(id: &str) -> Option<String> {
-    if !id.is_empty() && id.chars().all(|char| char.is_ascii_digit()) {
-        Some(id.to_string())
-    } else {
-        None
-    }
-}
+use crate::twitter::parse_tweet_id;
 
-// TODO: Get rid of this somehow, probably encoding the ID logic into a struct.
-// TODO: Error handling for inputs?
 fn expand_shorthand_to_url(path: &str, source: &Source) -> String {
     if *source == Source::X && (path.starts_with("tweet:media:") || path.starts_with("x:media:")) {
         return format!(
diff --git a/src/twitter.rs b/src/twitter.rs
new file mode 100644
index 0000000..5678c1a
--- /dev/null
+++ b/src/twitter.rs
@@ -0,0 +1,8 @@
+/// Returns the tweet ID if `id` is non-empty and contains only ASCII digits.
+pub fn parse_tweet_id(id: &str) -> Option<String> {
+    if !id.is_empty() && id.chars().all(|char| char.is_ascii_digit()) {
+        Some(id.to_string())
+    } else {
+        None
+    }
+}