diff --git a/home/bin/executable_todo_archive b/home/bin/executable_todo_archive
index c737366..fdc2838 100644
--- a/home/bin/executable_todo_archive
+++ b/home/bin/executable_todo_archive
@@ -6,10 +6,10 @@
 # ]
 # ///
 """
-Archive completed (DONE) todos from a [x]it! file.
+Archive completed (DONE) and obsolete todos from a [x]it! file.
 
-Extracts all checked items, outputs them (preserving groups), and removes them
-from the original file.
+Extracts all checked and obsolete items, outputs them (preserving groups), and
+removes them from the original file.
 """
 
 import argparse
@@ -25,6 +25,16 @@ def format_item(item: Item) -> str:
     return f"[{item.state.value}] {item.description}"
 
 
+def sort_groups(groups: list[Group]) -> list[Group]:
+    """
+    Sort groups: untitled groups first, then alphabetically by title.
+    """
+    untitled = [g for g in groups if not g.title]
+    titled = [g for g in groups if g.title]
+    titled.sort(key=lambda g: g.title.lower())
+    return untitled + titled
+
+
 def format_groups(groups: list[Group]) -> str:
     """Format a list of groups back to [x]it! syntax."""
     lines = []
@@ -41,28 +51,29 @@ def format_groups(groups: list[Group]) -> str:
     return "\n".join(lines)
 
 
-def extract_done_items(groups: list[Group]) -> tuple[list[Group], list[Group]]:
+def extract_archivable_items(groups: list[Group]) -> tuple[list[Group], list[Group]]:
     """
-    Split groups into done and remaining items.
+    Split groups into archivable (done/obsolete) and remaining items.
 
     Returns:
-        (done_groups, remaining_groups) - Both preserve group structure.
+        (archivable_groups, remaining_groups) - Both preserve group structure.
         Empty groups are preserved in remaining_groups.
     """
-    done_groups = []
+    archivable_states = {State.CHECKED, State.OBSOLETE}
+    archivable_groups = []
     remaining_groups = []
 
     for group in groups:
-        done_items = [item for item in group.items if item.state == State.CHECKED]
-        remaining_items = [item for item in group.items if item.state != State.CHECKED]
+        archivable_items = [item for item in group.items if item.state in archivable_states]
+        remaining_items = [item for item in group.items if item.state not in archivable_states]
 
-        if done_items:
-            done_groups.append(Group(title=group.title, items=done_items))
+        if archivable_items:
+            archivable_groups.append(Group(title=group.title, items=archivable_items))
 
         # Always preserve the group in remaining, even if empty
         remaining_groups.append(Group(title=group.title, items=remaining_items))
 
-    return done_groups, remaining_groups
+    return archivable_groups, remaining_groups
 
 
 def merge_groups(existing: list[Group], new: list[Group]) -> list[Group]:
@@ -103,8 +114,8 @@ def merge_groups(existing: list[Group], new: list[Group]) -> list[Group]:
 
 def main() -> int:
     parser = argparse.ArgumentParser(
-        description="Archive completed todos from a [x]it! file.",
-        epilog="Done items are extracted and removed from the input file.",
+        description="Archive completed and obsolete todos from a [x]it! file.",
+        epilog="Done and obsolete items are extracted and removed from the input file.",
     )
     parser.add_argument(
         "input",
@@ -114,9 +125,7 @@ def main() -> int:
     parser.add_argument(
         "output",
         type=Path,
-        nargs="?",
-        default=None,
-        help="Output file for archived todos (default: stdout)",
+        help="Output file for archived todos",
     )
 
     args = parser.parse_args()
@@ -128,39 +137,43 @@ def main() -> int:
     with open(args.input, "r") as fp:
         groups = parse_file(fp)
 
-    done_groups, remaining_groups = extract_done_items(groups)
+    archivable_groups, remaining_groups = extract_archivable_items(groups)
 
-    if not done_groups:
-        print("No completed todos found.", file=sys.stderr)
-        return 0
-
-    if args.output:
+    if archivable_groups:
         if args.output.exists():
             with open(args.output, "r") as fp:
                 existing_groups = parse_file(fp)
-            merged_groups = merge_groups(existing_groups, done_groups)
+            merged_groups = merge_groups(existing_groups, archivable_groups)
         else:
-            merged_groups = done_groups
+            merged_groups = archivable_groups
 
-        merged_output = format_groups(merged_groups)
+        merged_output = format_groups(sort_groups(merged_groups))
         with open(args.output, "w") as fp:
             fp.write(merged_output)
             fp.write("\n")
-    else:
-        print(format_groups(done_groups))
-
-    remaining_output = format_groups(remaining_groups)
-    with open(args.input, "w") as fp:
-        if remaining_output:
-            fp.write(remaining_output)
+        remaining_output = format_groups(remaining_groups)
+        with open(args.input, "w") as fp:
+            if remaining_output:
+                fp.write(remaining_output)
+                fp.write("\n")
+    elif args.output.exists():
+        # No new items to archive, but re-sort existing archive
+        with open(args.output, "r") as fp:
+            existing_groups = parse_file(fp)
+        sorted_output = format_groups(sort_groups(existing_groups))
+        with open(args.output, "w") as fp:
+            fp.write(sorted_output)
             fp.write("\n")
 
-    done_count = sum(len(g.items) for g in done_groups)
+    archived_count = sum(len(g.items) for g in archivable_groups)
     remaining_count = sum(len(g.items) for g in remaining_groups)
-    print(
-        f"Archived {done_count} completed todo(s). {remaining_count} remaining.",
-        file=sys.stderr,
-    )
+    if archived_count:
+        print(
+            f"Archived {archived_count} todo(s). {remaining_count} remaining.",
+            file=sys.stderr,
+        )
+    else:
+        print(f"Sorted {remaining_count} todo(s).", file=sys.stderr)
 
     return 0