> BTW, I have good backups of my data...!
>
>
>
This.

Also, what I've learnt recently is to periodically archive your backup -
either to another HDD or to some other media.

I recently had some bad luck whereby my backup USB HDD developed a fault
(or a software bug triggered a fault?) and consequently had some filesystem
corruption. This was the only copy of the backup data I had. I managed to
recover the data by attempting to repair the filesystem (ext4) using fsck
which put the data in lost+found. The only snag was that all the (thousands
of) directory names (about 10 years of accumulated data) have been replaced
by their inode numbers. This was down to the corruption being related to
"multiply claimed inode blocks" or some such.

I observed a kernel panic at the same time and have raised a bug about it
with Debian: <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=679830>

The trigger point seemed to be a manual rsync operation concerning a USB
HDD that overlapped an daily rsnapshot run (also rsync) to another USB HDD.
It's made me a bit leery about keeping my i/o ops on USB HDD devices rather
simple in future.

The long and short of it is: have an offline backup of your backups!

BTW, how much is expensive? I recently bought a new 2T WD Caviar Green from
an eBay trader for £75 inc postage.

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