diff --git a/backup.py b/backup.py
index 14e5981..4a5ad57 100644
--- a/backup.py
+++ b/backup.py
@@ -1,4 +1,18 @@
-from src import Database, StorageClient
+import sys
+from src import Database, FileSystem
 
-client = Database()
+class Backup(FileSystem):
+    def __init__(self, argv):
+        super().__init__()
+        self.db = Database()
+
+    def backup(self, obj: list) -> bool:
+        db_response = self.db.check_obj(obj)
+        return True
+
+    def backup_all(self):
+        for item in self.all():
+            self.backup(item)
+
+Backup(sys.argv).backup_all()
 print("OK")
\ No newline at end of file
diff --git a/src/__init__.py b/src/__init__.py
index 69526d3..c9d748d 100644
--- a/src/__init__.py
+++ b/src/__init__.py
@@ -2,7 +2,7 @@ from dotenv import load_dotenv
 
 from .glob import file_exists
 from .db import Database
-from .gcs import StorageClient
+from .fs import FileSystem
 
 if not file_exists(".env"):
 	raise FileNotFoundError("Environment variable file does not exist. Copy '.env.example' to '.env'")
diff --git a/src/cloud/__init__.py b/src/cloud/__init__.py
new file mode 100644
index 0000000..2a02487
--- /dev/null
+++ b/src/cloud/__init__.py
@@ -0,0 +1 @@
+from .gcs import client as GoogleCloudStorage
\ No newline at end of file
diff --git a/src/gcs/__init__.py b/src/cloud/gcs/__init__.py
similarity index 100%
rename from src/gcs/__init__.py
rename to src/cloud/gcs/__init__.py
diff --git a/src/gcs/client.py b/src/cloud/gcs/client.py
similarity index 100%
rename from src/gcs/client.py
rename to src/cloud/gcs/client.py
diff --git a/src/db/__init__.py b/src/db/__init__.py
index bae9c71..ff55f12 100644
--- a/src/db/__init__.py
+++ b/src/db/__init__.py
@@ -1 +1,2 @@
+from .sqlite import dbname
 from .database import Database
\ No newline at end of file
diff --git a/src/db/database.py b/src/db/database.py
index 03391a3..c2afba3 100644
--- a/src/db/database.py
+++ b/src/db/database.py
@@ -4,8 +4,9 @@ class Database(SQLite):
     def __init__(self):
         super().__init__()
 
-    def backup_candidate(self, anchor: str) -> bool:
-        sql = f"SELECT anchor, mtime, chksum FROM manifest WHERE anchor = '{anchor}'"
+    # Test if a candidate item should be backed up
+    def check_item(self, obj: list) -> bool:
+        sql = f"SELECT anchor, mtime, chksum FROM manifest WHERE anchor = '{obj.anchor}'"
         data = self.query(sql)
 
         return True
\ No newline at end of file
diff --git a/src/db/sqlite.py b/src/db/sqlite.py
index 8ee5281..5a40b8b 100644
--- a/src/db/sqlite.py
+++ b/src/db/sqlite.py
@@ -4,6 +4,8 @@ import sqlite3 as sqlite
 
 from ..glob import file_exists
 
+dbname = ".cloudbackup.db"
+
 class SQLite():
     def __init__(self):
         self.db = sqlite.connect(self.get_db_path())
@@ -34,15 +36,14 @@ class SQLite():
 
     # Get path to database file
     def get_db_path(self) -> str:
-        name = ".cloudbackup.db"
         path = os.getenv("SOURCE_FOLDER")
 
         # Append db file name if absent
-        if not path.endswith(name):
+        if not path.endswith(dbname):
             # Append tailing slash if absent
             if path[-1] != "/":
                 path += "/"
-            path += name
+            path += dbname
         return path
 
     # Prepare a fresh db with the expected table structure
diff --git a/src/fs/__init__.py b/src/fs/__init__.py
new file mode 100644
index 0000000..91c2a7b
--- /dev/null
+++ b/src/fs/__init__.py
@@ -0,0 +1 @@
+from .fs import FileSystem
\ No newline at end of file
diff --git a/src/fs/fs.py b/src/fs/fs.py
new file mode 100644
index 0000000..8473d30
--- /dev/null
+++ b/src/fs/fs.py
@@ -0,0 +1,30 @@
+import os
+import zlib
+
+from ..db import dbname
+
+class FileSystem:
+    def __init__(self):
+        self.path = FileSystem.get_path()
+
+    @staticmethod
+    def get_path() -> str:
+        return os.getenv("SOURCE_FOLDER")
+
+    @staticmethod
+    def chksum(data: str) -> str:
+        return zlib.crc32(data)
+
+    # Get metadata from candidate file or folder
+    def make_obj(self, anchor: str) -> list:
+        mtime = os.path.getmtime(anchor)
+        if os.path.isdir(anchor):
+
+
+        data = [anchor, mtime, chksum]
+        return obj
+
+    def all(self) -> list:
+        content = os.listdir(self.path)
+        content = list(map(self.make_obj, content))
+        return content
\ No newline at end of file