diff --git a/frontend/components/project/ProjectGroupTab.vue b/frontend/components/project/ProjectGroupTab.vue
index cab52be..240ce73 100644
--- a/frontend/components/project/ProjectGroupTab.vue
+++ b/frontend/components/project/ProjectGroupTab.vue
@@ -62,6 +62,7 @@
             v-model="drawerOpen"
             :group="selectedItem"
             :project-id="projectId"
+            :tasks="[...activeTasks, ...archivedTasks]"
             @saved="onSaved"
         />
     </div>
diff --git a/frontend/components/task/TaskGroupDrawer.vue b/frontend/components/task/TaskGroupDrawer.vue
index a8714f2..9d26d28 100644
--- a/frontend/components/task/TaskGroupDrawer.vue
+++ b/frontend/components/task/TaskGroupDrawer.vue
@@ -17,7 +17,32 @@
                 <ColorPicker v-model="form.color" />
             </div>
 
-            <div class="mt-6 flex justify-end">
+            <div
+                v-if="isEditing && !canArchive && !canUnarchive && nonFinalTasksCount > 0"
+                class="mt-4 rounded-md bg-amber-50 px-4 py-3 text-sm text-amber-700"
+            >
+                {{ $t('archive.groupNonFinalTasks', { count: nonFinalTasksCount }) }}
+            </div>
+
+            <div class="mt-6 flex items-center" :class="isEditing ? 'justify-between' : 'justify-end'">
+                <button
+                    v-if="canArchive"
+                    type="button"
+                    class="rounded-md bg-neutral-500 px-4 py-2 text-sm font-semibold text-white hover:bg-neutral-600 disabled:cursor-not-allowed disabled:opacity-50"
+                    :disabled="isSubmitting"
+                    @click="handleArchive"
+                >
+                    {{ $t('archive.archiveButton') }}
+                </button>
+                <button
+                    v-if="canUnarchive"
+                    type="button"
+                    class="rounded-md bg-neutral-500 px-4 py-2 text-sm font-semibold text-white hover:bg-neutral-600 disabled:cursor-not-allowed disabled:opacity-50"
+                    :disabled="isSubmitting"
+                    @click="handleUnarchive"
+                >
+                    {{ $t('archive.unarchiveButton') }}
+                </button>
                 <button
                     type="submit"
                     class="rounded-md bg-primary-500 px-6 py-2 text-sm font-semibold text-white hover:bg-secondary-500 disabled:cursor-not-allowed disabled:opacity-50"
@@ -32,12 +57,15 @@
 
 <script setup lang="ts">
 import type { TaskGroup, TaskGroupWrite } from '~/services/dto/task-group'
+import type { Task } from '~/services/dto/task'
 import { useTaskGroupService } from '~/services/task-groups'
+import { useTaskService } from '~/services/tasks'
 
 const props = defineProps<{
     modelValue: boolean
     group: TaskGroup | null
     projectId: number
+    tasks?: Task[]
 }>()
 
 const emit = defineEmits<{
@@ -79,6 +107,51 @@ watch(() => props.modelValue, (open) => {
 })
 
 const { create, update } = useTaskGroupService()
+const taskService = useTaskService()
+
+const groupTasks = computed(() =>
+    (props.tasks ?? []).filter(t => t.group?.id === props.group?.id)
+)
+
+const nonFinalTasksCount = computed(() =>
+    groupTasks.value.filter(t => t.status?.isFinal !== true).length
+)
+
+const canArchive = computed(() => {
+    if (!isEditing.value || !props.group || props.group.archived) return false
+    if (groupTasks.value.length === 0) return false
+    return nonFinalTasksCount.value === 0
+})
+
+const canUnarchive = computed(() => {
+    return isEditing.value && !!props.group?.archived
+})
+
+async function handleArchive() {
+    if (!props.group) return
+    isSubmitting.value = true
+    try {
+        await Promise.all(groupTasks.value.map(t => taskService.update(t.id, { archived: true })))
+        await update(props.group.id, { archived: true })
+        emit('saved')
+        isOpen.value = false
+    } finally {
+        isSubmitting.value = false
+    }
+}
+
+async function handleUnarchive() {
+    if (!props.group) return
+    isSubmitting.value = true
+    try {
+        await Promise.all(groupTasks.value.map(t => taskService.update(t.id, { archived: false })))
+        await update(props.group.id, { archived: false })
+        emit('saved')
+        isOpen.value = false
+    } finally {
+        isSubmitting.value = false
+    }
+}
 
 async function handleSubmit() {
     touched.title = true
diff --git a/frontend/i18n/locales/fr.json b/frontend/i18n/locales/fr.json
index 14c3697..bce1fa7 100644
--- a/frontend/i18n/locales/fr.json
+++ b/frontend/i18n/locales/fr.json
@@ -83,6 +83,7 @@
         "showArchived": "Voir les groupes archivés",
         "hideArchived": "Masquer les groupes archivés",
         "statusFinal": "Statut final",
-        "groupArchiveDisabled": "Tous les tickets doivent être en statut final pour archiver le groupe."
+        "groupArchiveDisabled": "Tous les tickets doivent être en statut final pour archiver le groupe.",
+        "groupNonFinalTasks": "Il reste {count} ticket(s) sans statut final dans ce groupe."
     }
 }
diff --git a/src/Entity/TaskStatus.php b/src/Entity/TaskStatus.php
index 3633d3f..8d6f0b0 100644
--- a/src/Entity/TaskStatus.php
+++ b/src/Entity/TaskStatus.php
@@ -92,7 +92,7 @@ class TaskStatus
         return $this;
     }
 
-    public function isFinal(): bool
+    public function getIsFinal(): bool
     {
         return $this->isFinal;
     }
diff --git a/src/Entity/TaskType.php b/src/Entity/TaskType.php
deleted file mode 100644
index e198edc..0000000
--- a/src/Entity/TaskType.php
+++ /dev/null
@@ -1,74 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace App\Entity;
-
-use ApiPlatform\Metadata\ApiResource;
-use ApiPlatform\Metadata\Delete;
-use ApiPlatform\Metadata\Get;
-use ApiPlatform\Metadata\GetCollection;
-use ApiPlatform\Metadata\Patch;
-use ApiPlatform\Metadata\Post;
-use App\Repository\TaskTypeRepository;
-use Doctrine\ORM\Mapping as ORM;
-use Symfony\Component\Serializer\Attribute\Groups;
-
-#[ApiResource(
-    operations: [
-        new GetCollection(),
-        new Get(),
-        new Post(security: "is_granted('ROLE_ADMIN')"),
-        new Patch(security: "is_granted('ROLE_ADMIN')"),
-        new Delete(security: "is_granted('ROLE_ADMIN')"),
-    ],
-    normalizationContext: ['groups' => ['task_type:read']],
-    denormalizationContext: ['groups' => ['task_type:write']],
-    order: ['label' => 'ASC'],
-)]
-#[ORM\Entity(repositoryClass: TaskTypeRepository::class)]
-class TaskType
-{
-    #[ORM\Id]
-    #[ORM\GeneratedValue]
-    #[ORM\Column]
-    #[Groups(['task_type:read', 'task:read', 'time_entry:read'])]
-    private ?int $id = null;
-
-    #[ORM\Column(length: 255)]
-    #[Groups(['task_type:read', 'task_type:write', 'task:read', 'time_entry:read'])]
-    private ?string $label = null;
-
-    #[ORM\Column(length: 7)]
-    #[Groups(['task_type:read', 'task_type:write', 'task:read', 'time_entry:read'])]
-    private ?string $color = '#222783';
-
-    public function getId(): ?int
-    {
-        return $this->id;
-    }
-
-    public function getLabel(): ?string
-    {
-        return $this->label;
-    }
-
-    public function setLabel(string $label): static
-    {
-        $this->label = $label;
-
-        return $this;
-    }
-
-    public function getColor(): ?string
-    {
-        return $this->color;
-    }
-
-    public function setColor(string $color): static
-    {
-        $this->color = $color;
-
-        return $this;
-    }
-}
diff --git a/src/Repository/TaskTypeRepository.php b/src/Repository/TaskTypeRepository.php
deleted file mode 100644
index 9267ddf..0000000
--- a/src/Repository/TaskTypeRepository.php
+++ /dev/null
@@ -1,17 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace App\Repository;
-
-use App\Entity\TaskType;
-use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
-use Doctrine\Persistence\ManagerRegistry;
-
-class TaskTypeRepository extends ServiceEntityRepository
-{
-    public function __construct(ManagerRegistry $registry)
-    {
-        parent::__construct($registry, TaskType::class);
-    }
-}