diff --git a/backend/internal/common/env_config.go b/backend/internal/common/env_config.go
index ca0f035a..9d25652e 100644
--- a/backend/internal/common/env_config.go
+++ b/backend/internal/common/env_config.go
@@ -88,7 +88,7 @@ func defaultConfig() EnvConfigSchema {
 		AppEnv:        AppEnvProduction,
 		LogLevel:      "info",
 		DbProvider:    "sqlite",
-		FileBackend:   "fs",
+		FileBackend:   "filesystem",
 		KeysPath:      "data/keys",
 		AppURL:        AppUrl,
 		Port:          "1411",
@@ -187,12 +187,12 @@ func validateEnvConfig(config *EnvConfigSchema) error {
 		}
 	case "database":
 		// All good, these are valid values
-	case "", "fs":
+	case "", "filesystem":
 		if config.UploadPath == "" {
 			config.UploadPath = defaultFsUploadPath
 		}
 	default:
-		return errors.New("invalid FILE_BACKEND value. Must be 'fs', 'database', or 's3'")
+		return errors.New("invalid FILE_BACKEND value. Must be 'filesystem', 'database', or 's3'")
 	}
 
 	// Validate LOCAL_IPV6_RANGES
diff --git a/backend/internal/common/env_config_test.go b/backend/internal/common/env_config_test.go
index 8faae952..3353be05 100644
--- a/backend/internal/common/env_config_test.go
+++ b/backend/internal/common/env_config_test.go
@@ -214,12 +214,12 @@ func TestParseEnvConfig(t *testing.T) {
 		t.Setenv("DB_PROVIDER", "sqlite")
 		t.Setenv("DB_CONNECTION_STRING", "file:test.db")
 		t.Setenv("APP_URL", "http://localhost:3000")
-		t.Setenv("FILE_BACKEND", "FS")
+		t.Setenv("FILE_BACKEND", "FILESYSTEM")
 		t.Setenv("UPLOAD_PATH", "")
 
 		err := parseEnvConfig()
 		require.NoError(t, err)
-		assert.Equal(t, "fs", EnvConfig.FileBackend)
+		assert.Equal(t, "filesystem", EnvConfig.FileBackend)
 		assert.Equal(t, defaultFsUploadPath, EnvConfig.UploadPath)
 	})
 
diff --git a/backend/internal/storage/storage.go b/backend/internal/storage/storage.go
index 0e7b1437..64854932 100644
--- a/backend/internal/storage/storage.go
+++ b/backend/internal/storage/storage.go
@@ -8,7 +8,7 @@ import (
 )
 
 var (
-	TypeFileSystem = "fs"
+	TypeFileSystem = "filesystem"
 	TypeS3         = "s3"
 )