diff --git a/.gitignore b/.gitignore
index 4f168b2..cb50d91 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,4 @@ backups/
 scan/
 dist-source/
 .worktrees/
+scripts/azurite/
diff --git a/CLAUDE.md b/CLAUDE.md
index 5d0ccd9..fdec8bf 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -29,7 +29,10 @@ uv run pytest tests/ -v -m "not integration"
 # Run a single test file
 uv run pytest tests/test_backup.py -v
 
-# Run integration tests (requires Azure Storage emulator at 192.168.9.101)
+# Start Azure Storage emulator (required for integration tests)
+docker compose -f scripts/docker-compose.yml up -d
+
+# Run integration tests (requires emulator running via docker compose above)
 uv run pytest tests/test_integration.py -v
 
 # Seed test data into the emulator
@@ -72,4 +75,4 @@ Override config path with `order-bak --config /path/to/config.toml <command>`.
 
 ### Integration Tests
 
-The integration test (`tests/test_integration.py`) hits a real Azure Storage emulator at `192.168.9.101:10002`. Override the endpoint via `ORDER_BAK_TEST_CONNECTION_STRING` env var. Tests are gated by the `integration` pytest marker.
+Integration tests (`tests/test_integration.py`) require the Azure Storage emulator running locally via `scripts/docker-compose.yml` (azurite on `localhost:10002`). Start it with `docker compose -f scripts/docker-compose.yml up -d` before running. Tests are gated by the `integration` pytest marker. Override the endpoint via `ORDER_BAK_TEST_CONNECTION_STRING` env var if needed.
diff --git a/assets/config.toml b/assets/config.toml
index e60fb8c..7b52c4c 100644
--- a/assets/config.toml
+++ b/assets/config.toml
@@ -9,6 +9,9 @@ connection_string = ""
 # delay_ms = 200
 # scan_dir = "./scan"
 
+[backup]
+# retain_days = 1
+
 [delete]
 # batch_size = 100
 # delay_ms = 300
diff --git a/assets/local.toml b/assets/local.toml
index 6bd6db5..29a6634 100644
--- a/assets/local.toml
+++ b/assets/local.toml
@@ -7,6 +7,9 @@ page_size = 500
 delay_ms = 200
 scan_dir = "./scan"
 
+[backup]
+retain_days = 1
+
 [delete]
 batch_size = 100
 delay_ms = 300
diff --git a/assets/s101.toml b/assets/s101.toml
index d2f9a09..668c96b 100644
--- a/assets/s101.toml
+++ b/assets/s101.toml
@@ -7,6 +7,9 @@ page_size = 500
 delay_ms = 200
 scan_dir = "./scan"
 
+[backup]
+retain_days = 1
+
 [delete]
 batch_size = 100
 delay_ms = 300
diff --git a/assets/sandbox.toml b/assets/sandbox.toml
index 3e2350a..8c54015 100644
--- a/assets/sandbox.toml
+++ b/assets/sandbox.toml
@@ -7,6 +7,9 @@ page_size = 500
 delay_ms = 200
 scan_dir = "./scan"
 
+[backup]
+retain_days = 1
+
 [delete]
 batch_size = 100
 delay_ms = 300
diff --git a/scripts/docker-compose.yml b/scripts/docker-compose.yml
new file mode 100644
index 0000000..f2d5a0a
--- /dev/null
+++ b/scripts/docker-compose.yml
@@ -0,0 +1,9 @@
+services:
+  azure:
+    image: mcr.microsoft.com/azure-storage/azurite
+    ports:
+      - 10000:10000
+      - 10001:10001
+      - 10002:10002
+    volumes:
+      - ./azurite:/data
diff --git a/src/order_bak/cli.py b/src/order_bak/cli.py
index 658ff57..e68c506 100644
--- a/src/order_bak/cli.py
+++ b/src/order_bak/cli.py
@@ -31,7 +31,7 @@ def scan(ctx, count):
 
 
 @main.command()
-@click.option("--days", required=True, type=int, help="Backup orders older than N days (min 1)")
+@click.option("--days", default=None, type=int, help="Backup orders older than N days (min 1); default from config backup.retain_days")
 @click.option("--scan", "scan_path", default=None, type=click.Path(), help="Path to scan CSV (default: latest in scan_dir)")
 @click.pass_context
 def backup(ctx, days, scan_path):
@@ -42,6 +42,9 @@ def backup(ctx, days, scan_path):
     cfg = load_config(ctx.obj["config_path"])
     from order_bak.backup import backup_orders
 
+    if days is None:
+        days = cfg.backup_retain_days
+
     if scan_path:
         scan_file = Path(scan_path)
     else:
diff --git a/src/order_bak/config.py b/src/order_bak/config.py
index 3a71225..eec0cd5 100644
--- a/src/order_bak/config.py
+++ b/src/order_bak/config.py
@@ -12,6 +12,7 @@ class Config:
     scan_dir: Path = Path("./scan")
     delete_batch_size: int = 100
     delete_delay_ms: int = 300
+    backup_retain_days: int = 1
 
 
 def load_config(config_path: Path) -> Config:
@@ -30,6 +31,7 @@ def load_config(config_path: Path) -> Config:
 
     scan = raw.get("scan", {})
     delete = raw.get("delete", {})
+    backup = raw.get("backup", {})
 
     return Config(
         azure_connection_string=connection_string,
@@ -38,4 +40,5 @@ def load_config(config_path: Path) -> Config:
         scan_dir=Path(scan.get("scan_dir", "./scan")),
         delete_batch_size=delete.get("batch_size", 100),
         delete_delay_ms=delete.get("delay_ms", 300),
+        backup_retain_days=backup.get("retain_days", 1),
     )
diff --git a/tests/test_integration.py b/tests/test_integration.py
index 1b2d014..c2a0a8f 100644
--- a/tests/test_integration.py
+++ b/tests/test_integration.py
@@ -14,7 +14,7 @@ from order_bak.csv_utils import read_csv
 from order_bak.delete import delete_orders
 from order_bak.scan import scan_orders
 
-CONFIG_PATH = Path(__file__).parent.parent / "assets" / "s101.toml"
+CONFIG_PATH = Path(__file__).parent.parent / "assets" / "local.toml"
 
 CONNECTION_STRING = os.environ.get(
     "ORDER_BAK_TEST_CONNECTION_STRING",
@@ -23,9 +23,9 @@ CONNECTION_STRING = os.environ.get(
         "AccountKey=Eby8vdM02xNOcqFlqUwJPLlmEtlCDXJ1OUzFT50uSRZ6IFsuFq2UVErCz4I6tq/"
         "K1SZFPTOtr/KBHBeksoGMGw==;"
         "DefaultEndpointsProtocol=http;"
-        "BlobEndpoint=http://192.168.9.101:10000/devstoreaccount1;"
-        "QueueEndpoint=http://192.168.9.101:10001/devstoreaccount1;"
-        "TableEndpoint=http://192.168.9.101:10002/devstoreaccount1;"
+        "BlobEndpoint=http://localhost:10000/devstoreaccount1;"
+        "QueueEndpoint=http://localhost:10001/devstoreaccount1;"
+        "TableEndpoint=http://localhost:10002/devstoreaccount1;"
     ),
 )