The filtering rules should also include automatic purging or backup of aged data and a mechanism to expire large XML files sooner.

筛选规则还应该包括对旧数据的自动清除或者备份、以及使大的XML文件不久后过期的机制。

youdao

And MobileMe lacks some obvious features, like online backup or automatic syncing of all files.

而且，MobileMe缺乏一些常用的功能，例如网上备份或自动同步所有文件。

youdao

Simply plug it in to your computer, then connect the other manufacturer's hard drive and it instantly becomes a totally automatic Clickfree backup drive that searches, organizes and backs up all of your PC data and digital files.

ENGADGET: Clickfree Transformer Cable gives any USB hard drive auto backup functionality