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问题:rclone 底层重试只覆盖单个 HTTP 请求,但 Google API 的 502/timeout 等临时故障会导致整个上传操作失败,自动触发的备份任务连续失败。 修复:在 provider.Upload 外层增加操作级重试(最多 3 次,指数退避 10s/40s/90s), 每次重试重新打开文件并重建 reader 链。重试过程通过日志流实时反馈。
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在 provider.Upload 外层增加最多 3 次重试(指数退避),覆盖 Google Drive 502/timeout 等场景