diff --git a/build.py b/build.py
index 2940523..f1ad92c 100755
--- a/build.py
+++ b/build.py
@@ -23,6 +23,8 @@ targets_meta = Target.load_meta(f"config/target_meta.json")
 target_board = Board(args.board, f"config/board/{args.board}.json", targets_meta)
 os.set_board(target_board)
 
+os.check_rootfs()
+
 if (args.sync):
     target_board.sync()
 elif (args.target != ""):
diff --git a/files/backups/excl_min.lst b/files/backups/excl_min.lst
index feca53a..202cf4f 100644
--- a/files/backups/excl_min.lst
+++ b/files/backups/excl_min.lst
@@ -3,9 +3,9 @@ boot/*
 media/*
 usr/lib/python3.13/test*
 usr/lib64/perl5*
-usr/src/*
+#usr/src/*
 var/cache/binpkgs/*
 var/cache/distfiles/*
-vvar/cache/edb/*
+var/cache/edb/*
 var/cache/eix/*
 var/log/*.log
diff --git a/scripts/os.py b/scripts/os.py
index 0434dd6..67bc5ea 100644
--- a/scripts/os.py
+++ b/scripts/os.py
@@ -1,4 +1,4 @@
-import subprocess, os, sys, datetime, getpass, shutil
+import subprocess, os, sys, datetime, getpass, shutil, requests
 from pathlib import Path
 if __name__ != '__main__':
     from . import *
@@ -21,6 +21,23 @@ class OS:
             lst.append(act[0])
         return lst
 
+    def check_rootfs(self):
+        root_marker = Path(self.root_dir)
+        if (not root_marker.is_dir()):
+            Logger.os(f"Download base OS rootfs archive...")
+            temp_dir = f"{ROOT_DIR}/build/tmp"
+            os.makedirs(temp_dir, exist_ok=True)
+            r = requests.get("https://cloud.andreil.by/public.php/dav/files/sbc-rootfs-archive", stream=True)
+            arch_fn = f"{temp_dir}/sbc_rootfs_archive.tar.xz"
+            with open(arch_fn, 'wb') as f:
+                total_length = int(r.headers.get('content-length'))
+                for chunk in r.iter_content(chunk_size=1024):
+                    f.write(chunk)
+            os.makedirs(self.root_dir, exist_ok=True)
+            self.__extract_tar(arch_fn, self.root_dir)
+            self.__tmp_clean(temp_dir)
+            self.__chroot("eix-sync -v")
+
     def set_board(self, board):
         self.board = board
         self.arch = board.parse_variables("%{ARCH}%")