A Cautionary Tale - About Backups
- From: "Jeff Gaines" <jgaines_newsid@xxxxxxxxxxx>
- Date: 31 May 2006 15:04:24 GMT
We had a discussion in here about backing up / synchronising / mirroring a while back.
My backups are scheduled and I get an email each morning advising me the status. This morning the email said:
[HDD Usage Status]
RAID Array 1 Usage Rate : 648424 kbytes / 243362140 kbytes (Usage Rate 1%)
RAID Array 2 Usage Rate : 665908 kbytes / 243362140 kbytes (Usage Rate 1%)
Whoops!!!
This is my NAS which has 2 RAID 1 arrays of 250 GB each and which should be about 65% full.
I first checked that my main Data drive was OK, it was, and the primary backup, which is a second HD on the main PC, that was OK too.
I then discovered that a small spare PC had been left on, and it also runs a scheduled backup each night. Unfortunately in playing with it I had fiddled with drive letters not realising the backups were scheduled. What it had done was mirrored the 64MB or so on its HD first to RAID Array 1 and then to RAID Array 2, i.e. it had done exactly what it was supposed to, deleted anything from the RAID arrays that was not on its own HD.
There must be a lesson to be learnt, I suppose a backup rather than mirroring the drives would have prevented this happening. I'll have to think it through.
In the meantime I am running the backups from the main PC, which may take a while, to the NAS to get my data back.
I suppose it proves that there's no such thing as too many backups :-)
--
Jeff Gaines - Damerham Hampshire UK
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