Mac OS X system from Mac Computer can hardly achieves backup automatically, however, you have no necessary to worry about this trifle. I recommend you to download "Email Backup" which can help you finish backup automatically, such as Apple Mail、Entourage、Eudora、Thunderbird client-side email.

As the screen shot on the above, you are allowed to set Email Backup email client-side, eg.: Apple Mail、Entourage、Eudora、Thunderbird. Then choose the place where you are going to put in, the auto Backup time, which day in a week you make backup. What's worth to saying that Email Backup has simple-to-use system, you can read A,B,C then the software could finish back up in a short time.

So what can i do if i want to revert to the original email, what you need to do is to paste your file(s）to the Mail folder under database which is listed under the user you are using.

Do you think it's quite useful for you, so say "thanks" to me , i guarantee that i will bring surprise here at irregular intervals.