[Feature] too many pod for backup

[acekingke]

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@ Nrehearsal
1.现在备份job会一直保留，导致有很多已完成的pod存在，没有必要
解决方法：
1.定义两个 job 名字 backup-manual-job,backup-auto-job
2.manual-backup1->创建backup-manual-job
3.manual-backup2->先删除backup-manual-job，再创建backup-manual-job
4.auto-backup1->创建backup-auto-job
5.auto-backup2->先删除backup-auto-job，再创建backup-auto-job
6.这样backup-manual-job,backup-auto-job 就会只保留最近一次的

[Nrehearsal]

@zhl003 @runkecheng is it necessary to keep the history of backup job? I'm worried that the cluster is running for a long time and there will be many pods which in completed state

[zhl003]

It is necessary to keep record of backup history but not need to keep backup job that is completed ,rewrite the backup result to backup CR status?

[Nrehearsal]

@zhl003 I think so. @acekingke how to rewrite the failed reason from pod to backup CR 😂?