Miserable! I overwrite the etcoptvar folder

Miserable! I covered the etcoptvar folder-general Linux technology-Linux programming and kernel information. The following is a detailed description. I feel uneasy about it. So when the situation hasn't happened, think about the countermeasures in advance!
Too much pressure on DBAs. I'm a newbie, beginner !!! Hope someone can provide guidance.
A few weeks ago, we performed data backup and recovery. The backup file contains the oracle database, and Etc, opt, varFile. At that time, I asked people how to restore.
Someone else said they would just decompress the backup tar back. I decompress the package directly. But the tar file also contains the content of the oracle database, Etc, opt, varFolder. However, since the machine has never been started, it is still running normally. I don't know. What if I restart that server ???????? System Crash? Unable to start the system ???
It's terrible. I am also very scared. I regret that I replied directly. Not so much consideration !! That's the customer's machine...

I realized that the cause of this problem was that I installed another server, so that I could not copy it from another machine. After I did it Etc, opt, varCopy the file and restart the machine. As a result, the system crashes and cannot be started. No way, I re-installed the OS (the original data is not deleted during installation), and the result is fine. No problem. As a result, I thought that the recovered machine never started. A cold heart ....

Ah, I am just an apprentice who has just learned to work as a DBA. Although I have more than three years of software development experience, I have no idea how to access the server .... as a result, I am a normal DBA, And I am under a lot of pressure. Every time I start the server, my blood pressure increases and my heartbeat is accelerating. I am afraid of the day when my myocardial infarction will die!

[ This post was last edited by the crystal ball at, September 18 ,.]