Back Up... Quality Loss?

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  • 11-18-2009, 01:03 PM
    caleb
    Back Up... Quality Loss?
    I have all my original files and important photoshop files backed up on an external hard drive. I'd like a little more protection because I would be devastated if it died. If I use a DVD-R and make copies of copies on it, 1) will quality suffer 2) is this better than getting a second external hd?

    I'm asking about quality because most of my files are jpg and I've heard that repeated copying of jpg files will kill quality. So this is more or less like theory, since I would only have maybe a single copy from copy.
  • 11-18-2009, 01:19 PM
    SmartWombat
    Re: Back Up... Quality Loss?
    Copying files does not affect quality.
    Opening and SAVING files loses quality - even if you don't edit them.

    I would not rely on DVD copies alone.
    I have had bad drives, that write discs but can't read them reliably - but they work on another drive.
    I have had bad discs, that write and verify as OK - but verify slowly and can't be read on other drives.
    This is on 3 or 4 computers, Dell by far being the worst for DVD drive quality.

    I now use a BENQ drive, bought as an internal drive, then put in an external USB case with good ventilation and a fan. It is good quality, and I haven't had any errors.

    BUT don't rely on only one backup ... Make more than one.
    Don't keep them in the same place, either.
    If the worst happens (home fire) you'll be glad you had a backup in the garage.

    I have multiple layers of backup.
    1) working storage on 4TB NAS, RAID 5 - protected against single disk failure
    2) automatically copied to second 4TB NAS, RAID 5.
    3) automatically copies this year's RAW, JPG and XMP files to third 3TB NAS, RAID 5.

    All files up to August 2009 copied to 2TB external drive and that drive put away for Archive.

    I think I'm covered.
    But I plan to put a NAS somewhere else, and backup to it across the internet, automatically, each day. I just need to find a safe place for it.
  • 11-18-2009, 04:26 PM
    BlueRob
    Re: Back Up... Quality Loss?
    As Wombat said no quality lose for copying (backing up).
    Follow the egg rule....never put or store all your eggs in the same basket. There is no fault proof backup system, nothing is perfect. The safest way to go is to have at least a HD to backup and external media stored somewhere else. The more you have the less risk you have.
  • 11-20-2009, 12:10 AM
    caleb
    Re: Back Up... Quality Loss?
    I did just a little bit of googling and may have found the problem you mention about DVD copies, SW: http://en.wikipedia.org/wiki/DVD-RAM (see the part that discusses DVD-RAM vs DVD-R/W)

    Thanks for the info, I'm going to start doing monthly backups to external hard drive, DVD-RAM copies, and keep as many of the final files on my main hard drive as space allows.