diff --git a/CHANGES b/CHANGES
index 8619707d9..f33f4cda6 100644
--- a/CHANGES
+++ b/CHANGES
@@ -3106,4 +3106,5 @@
 [9.1.0]
 * Update mongodb to 7.0.28 (also fixes mongobleed)
 * docker: do not use auth for appstore images
+* backup: add synology C2
 
diff --git a/dashboard/src/components/AppImportDialog.vue b/dashboard/src/components/AppImportDialog.vue
index 95d34ae9b..683329096 100644
--- a/dashboard/src/components/AppImportDialog.vue
+++ b/dashboard/src/components/AppImportDialog.vue
@@ -90,6 +90,9 @@ async function onSubmit() {
     } else if (provider.value === 'hetzner-objectstorage') {
       config.region = 'us-east-1';
       config.signatureVersion = 'v4';
+    } else if (provider.value === 'synology-c2-objectstorage') {
+      config.region = 'us-east-1';
+      config.signatureVersion = 'v4';
     }
   } else if (mountlike(provider.value)) {
     config.prefix = prefix;
diff --git a/dashboard/src/components/BackupProviderForm.vue b/dashboard/src/components/BackupProviderForm.vue
index 826d0334b..1b0b09f7b 100644
--- a/dashboard/src/components/BackupProviderForm.vue
+++ b/dashboard/src/components/BackupProviderForm.vue
@@ -202,8 +202,8 @@ onMounted(async () => {
       <TextInput id="backupDirInput" v-model="providerConfig.backupDir" placeholder="/opt/backups" required />
     </FormGroup>
 
-    <!-- S3/Minio/SOS/GCS/UpCloud/B2/R2 -->
-    <FormGroup v-if="provider === 'minio' || provider === 'upcloud-objectstorage' || provider === 'backblaze-b2' || provider === 'cloudflare-r2' || provider === 's3-v4-compat' || provider === 'idrive-e2'">
+    <!-- Endpoint - S3/Minio/SOS/GCS/UpCloud/B2/R2/C2 -->
+    <FormGroup v-if="provider === 'minio' || provider === 'upcloud-objectstorage' || provider === 'backblaze-b2' || provider === 'cloudflare-r2' || provider === 's3-v4-compat' || provider === 'idrive-e2' || provider === 'synology-c2-objectstorage'">
       <label for="endpointInput">{{ $t('backups.configureBackupStorage.s3Endpoint') }}</label>
       <TextInput id="endpointInput" v-model="providerConfig.endpoint" placeholder="https://s3endpoint.example.com" required />
     </FormGroup>
@@ -222,7 +222,7 @@ onMounted(async () => {
       <small class="helper-text">{{ $t('backups.configureBackupStorage.prefixHelperText') }}</small>
     </FormGroup>
 
-    <!-- S3/Minio/SOS/GCS -->
+    <!-- Region Selector -->
     <FormGroup v-if="
       provider === 's3' ||
       provider === 'digitalocean-spaces' ||
diff --git a/dashboard/src/components/BackupSiteAddDialog.vue b/dashboard/src/components/BackupSiteAddDialog.vue
index 708504b7c..872622b1c 100644
--- a/dashboard/src/components/BackupSiteAddDialog.vue
+++ b/dashboard/src/components/BackupSiteAddDialog.vue
@@ -100,6 +100,9 @@ async function onSubmit() {
     } else if (provider.value === 'hetzner-objectstorage') {
       data.region = 'us-east-1';
       data.signatureVersion = 'v4';
+    } else if (provider.value === 'synology-c2-objectstorage') {
+      data.region = 'us-east-1';
+      data.signatureVersion = 'v4';
     }
   } else if (mountlike(provider.value)) {
     data.prefix = providerConfig.value.prefix;
diff --git a/dashboard/src/constants.js b/dashboard/src/constants.js
index 9d34ce7ab..10cf63c9a 100644
--- a/dashboard/src/constants.js
+++ b/dashboard/src/constants.js
@@ -306,6 +306,7 @@ const STORAGE_PROVIDERS = [
     { name: 'S3 API Compatible (v4)', value: 's3-v4-compat' },
     { name: 'Scaleway Object Storage', value: 'scaleway-objectstorage', regions: REGIONS_SCALEWAY },
     { name: 'SSHFS Mount', value: 'sshfs' },
+    { name: 'Synology C2', value: 'synology-c2-objectstorage' },
     { name: 'UpCloud Object Storage', value: 'upcloud-objectstorage' },
     { name: 'Vultr Object Storage', value: 'vultr-objectstorage', regions: REGIONS_VULTR },
     { name: 'Wasabi', value: 'wasabi', regions: REGIONS_WASABI },
diff --git a/dashboard/src/utils.js b/dashboard/src/utils.js
index 482c1be71..1fb1c990e 100644
--- a/dashboard/src/utils.js
+++ b/dashboard/src/utils.js
@@ -32,7 +32,7 @@ function s3like(provider) {
     || provider === 'scaleway-objectstorage' || provider === 'wasabi' || provider === 'backblaze-b2' || provider === 'cloudflare-r2'
     || provider === 'linode-objectstorage' || provider === 'ovh-objectstorage' || provider === 'ionos-objectstorage'
     || provider === 'vultr-objectstorage' || provider === 'upcloud-objectstorage' || provider === 'idrive-e2'
-    || provider === 'contabo-objectstorage';
+    || provider === 'contabo-objectstorage' || provider === 'synology-c2-objectstorage';
 }
 
 function regionName(provider, endpoint) {
diff --git a/src/backupsites.js b/src/backupsites.js
index 9ee101659..9ab001298 100644
--- a/src/backupsites.js
+++ b/src/backupsites.js
@@ -98,6 +98,7 @@ function storageApi(backupSite) {
     case 'upcloud-objectstorage': return require('./storage/s3.js');
     case 'contabo-objectstorage': return require('./storage/s3.js');
     case 'hetzner-objectstorage': return require('./storage/s3.js');
+    case 'synology-c2-objectstorage': return require('./storage/s3.js');
     default: throw new BoxError(BoxError.BAD_FIELD, `Unknown provider: ${backupSite.provider}`);
     }
 }