I have a kind of philosophical question.
I'm about to set a new backup server and as time is passing encryption of data seems more and more reasonable.
However what if the harddrive goes bad. I know that the question seems simple, but...
...there is no such a thing like perfect HD. I had situation that I lost drive that was safely placed on the shelf. After lying for ~1 year it wouldn't spin up. Of course, in this case with-or-without encryption data are gone. However, taking in account, that 3 out of ~100 server-quality SAS-Drives I have around, have lost some sectors during last 3 years, I'm really not feeling comfortable. What is the sense of backup if some broken sectors render unknown file or even whole partition useless.
Other obvious side is: what if HD with sensible data goes missing? We had once situation that cleaning staff forgot to close in the morning our server room. With dozens of students passing this room daily it's more a question of luck (or high moral) that some of the cages weren't emptied.
As I use Linux, I checked what solution are available. I've read a bit about a stacked filesystem and a block device encryption but still, from what I understood, most of the HD-recovery tools have problems if the partition is encrypted.
I'm not talking about hacking into the data. I assume that I will always have a key-file or a password that is required for decryption.
Anyone would care to share some thoughts about it?