Switched to dedicated sync service

OneDrive/OneDriveClient.cs

@@ -0,0 +1,27 @@
+using OneDriveBackupService.Models;
+
+namespace OneDriveBackupService.OneDrive;
+
+public sealed class OneDriveClient(ConfigData config) {
+    public void UploadFile(string filePath) {
+        Directory.CreateDirectory(config.BackupUploadRoot);
+        var destFileName = Path.Combine(config.BackupUploadRoot, Path.GetFileName(filePath));
+        File.Move(filePath, destFileName);
+    }
+
+    public int DeleteOldFiles() {
+        var directory = new DirectoryInfo(config.BackupUploadRoot);
+
+        var filesToDelete = directory.EnumerateFiles()
+            .Where(f => f.Name.StartsWith("backup_") && f.Name.EndsWith(".tar.gz"))
+            .OrderByDescending(f => f.CreationTimeUtc)
+            .Skip(config.KeepLast)
+            .ToArray();
+        
+        foreach (var file in filesToDelete) {
+            file.Delete();
+        }
+
+        return filesToDelete.Length;
+    }
+}