diff --git a/src/views/ops-backup.vue b/src/views/ops-backup.vue
index 9c7488b..fac82ec 100644
--- a/src/views/ops-backup.vue
+++ b/src/views/ops-backup.vue
@@ -39,7 +39,10 @@
               dense
               :readonly="formState.readOnly"
               :label="$sock.t('BackupSetsToKeep')"
-              :rules="[form().integerValid(this, 'backupSetsToKeep')]"
+              :rules="[
+                form().integerValid(this, 'backupSetsToKeep'),
+                form().minValueValid(this, 'backupSetsToKeep', 1)
+              ]"
               :error-messages="form().serverErrors(this, 'backupSetsToKeep')"
               type="number"
               @input="fieldValueChanged('backupSetsToKeep')"