Add retries and retry-wait

Signed-off-by: Leonidas Avdelas <avdelasleonidas@gmail.com>

templates/config.yaml.j2

@@ -89,6 +89,19 @@ storage:
     remote_rate_limit: {{ borg_remote_rate_limit }}
 {% endif %}
 
+    # Number of times to retry a failing backup before giving up.
+    # Defaults to 0 (i.e., does not attempt retry).
+{% if borgmatic_retries is defined %}
+    retries: {{ borgmatic_retries }}
+{% endif %}
+
+    # Wait time between retries (in seconds) to allow transient
+    # issues to pass. Increases after each retry as a form of
+    # backoff. Defaults to 0 (no wait).
+{% if borgmatic_retry_wait is defined %}
+    retry_wait: {{ borgmatic_retry_wait }}
+{% endif %}
+
     # Command to use instead of just "ssh". This can be used to specify ssh options.
     # ssh_command: ssh -i ~/.ssh/id_ed25519
 {% if borg_ssh_command %}