在ESM中mailbox store的属性limits选项上,我的deletion settings如下:<br>
keep deleted items for 1 days<br>
keep deleted mailboxes for 1 days<br>
下面有一个勾选<br>
Do not permanently delete mailboxes and items until the store has been backup.我将它勾选了但我不明白具体的意思,是哪一种备份方式呢?又是由谁来完成的呢?