Added Retries

Worker.cs

@@ -6,6 +6,9 @@ using OneDriveBackupService.OneDrive;
 namespace OneDriveBackupService;
 
 public class Worker(ILogger<Worker> logger, ConfigData config, OneDriveClient client) : BackgroundService {
+
+    private bool _hasErrors = false;
+    
     protected override async Task ExecuteAsync(CancellationToken stoppingToken) {
         if (Environment.GetCommandLineArgs().Contains("--run-once")) {
             logger.LogInformation("Manual backup triggered");
@@ -34,7 +37,21 @@ public class Worker(ILogger<Worker> logger, ConfigData config, OneDriveClient cl
             logger.LogInformation("Next backup: {time}", nextRun.ToString("f"));
             await Task.Delay(delay, stoppingToken);
 
+            _hasErrors = false;
             await RunBackup(nextRun, stoppingToken);
+
+            if (_hasErrors) {
+                for (var i = 0; i < 3 && _hasErrors; i++) {
+                    logger.LogInformation("Backup failed, trying again in 5 minutes");
+                    await Task.Delay(TimeSpan.FromMinutes(5), stoppingToken);
+                    _hasErrors = false;
+                    await RunBackup(nextRun, stoppingToken);
+                }
+
+                if (_hasErrors) {
+                    logger.LogCritical("Backup still failing, skipping retries");
+                }
+            }
         }
     }
 
@@ -44,6 +61,7 @@ public class Worker(ILogger<Worker> logger, ConfigData config, OneDriveClient cl
         var file = await CreateBackupArchive(optimalTime, stoppingToken);
         if (string.IsNullOrEmpty(file)) {
             logger.LogError("Backup archive creation failed");
+            _hasErrors = true;
             return;
         }