We have a QNAP SERVER, 3.5.0 Build 0816T, model TS410 ; using 4 hard drives.
We had a power failure and after it returns , we tried to log in for our files but we failed, and checked the disk management and found that our files were gone.
However, Please be noted that due to our continuous power failure in our country , Syria, we are using a UPS for the server. And since we sometimes face long power failures, sometimes the UPS is completely off charge.
After we made a scan for the 4 drives , we noted some bad sectors.
Also, we checked the resource monitor and found that the free space of the 4 drives is 100%.
In spite the fact that we have lots of power failure, but we think I it is not the cause of the problem. Because each time we have a power failure, the server used to run properly after the power is back.
Now the server is still running but we cannot access our files since they are gone.
Our question is how can we restore our lost files due to their importance, and what do you think the cause of this problem is. Moreover, we want to know how to avoid such a problem in the future.
We will highly appreciate your urgent reply.