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Thread: Backup strategy

  1. #1
    2 Star Lounger
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    At present we use an external hard drive to back up our system. Full backup one a week and daily increments. The external drive is then taken off site each night.

    Our insurance company are now insisting that we keep a backup off site at all times and suggested we get a second external drive and do the backups on alternate days to each drive.

    This doesn't seem right to me

    On drive A we will have day1 + day3 + day 5 + day 7
    On drive B we will have day2 + day4 + day6

    Unless I am going mad that means if one drive is lost/stolen/destroyed (especially drive A) we have a totally useless backup

    Am I right?

    David

  2. #2
    Plutonium Lounger
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    If the full backup is made on day 1 on drive A, the backups on drive B will be useless without drive A.
    Without drive B, you can at least restore the full backup from drive A.

    If you really have to backup to 2 different drives, you should make a full backup every day.

  3. #3
    Super Moderator jscher2000's Avatar
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    Are they requiring that you have an up-to-date backup off site at all times? Obviously it would not be difficult to have a week-old backup off site at all times, since you could simply switch the drives at the end of a week.

    If you want to have something better, and the offsite location does not have a PC that would let you copy disk1 to disk2, you could get a third hard drive to rotate with the second. After doing the current day's full or incremental, you could clone disk1 to whichever of disk2/disk3 is onsite and take them both offsite. The next day, you would bring back disk1 and the older of disk2/disk3.

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    Plutonium Lounger
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    Hans' idea has a lot of merit in that today's imaging software is pretty fast and I don't think it would be too "painful" to do a full backup every day instead of an incremental.

    My full backup yesterday of about 84 gigabytes took just under an hour and a half. I realize that's a lot longer than minutes that an incremental would take, but it could work for you.

  5. #5
    Plutonium Lounger
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    You could also consider using differential backups. To recover from a differential backup you need the original image and the most recent differential, but not the ones in between. This may let you devise a strategy where you take two image backups at the weekend, to both disks, then move one off site and swap which drive is offsite each day.

  6. #6
    Uranium Lounger
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    Would an online backup fit the criteria for your insurance company ??
    <IMG SRC=http://www.wopr.com/w3tuserpics/DocWatson_sig.gif>

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    Cool

    Thanks for all the input.

    Decided to go for full backups each day

    DD

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    Plutonium Lounger
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    [quote name='dd_uk' post='798976' date='20-Oct-2009 12:51']Thanks for all the input.

    Decided to go for full backups each day

    DD[/quote]
    That's certainly easiest to manage, provided you have enough time and disk space.

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