Append to Incremental backup job

Posted on 2005-04-16
Last Modified: 2013-12-01
Does anyone see a problem with me performing one full backup weekly on Friday,  then using 1 tape and appending the data backed up from Monday thru Thursday?  
Question by:scotto2003
    LVL 57

    Accepted Solution

    Other than that one tape being a single point of failiure (and providing it has the capacity of course) - then no
    LVL 13

    Assisted Solution

    It sounds as if you plan to leave that one tape on site.  One fire, one flood, one tape break and there goes your data along with productivity.  Also, you'll also be writing to the same tape several more times than if you rotated the tapes, so the overall reliability of the tape become reduced substantially.  Also, your restore time will be increased depending on your choice of backups--incrementa or diferential.  If you can append with full backups, restore time will not be increased.

    Results of plan:
    1. Reduced tape reliability.
    2. Increased risk of overall data loss.
    3. Increased risk of production loss.
    4. Possible restore time increase.

    In backups, the name of the game is RESTORATION.  
    It seems as if a tape rotation is not planned.  The first thing every morning, the backup tape should be removed from the facility and stored off site--not in someone's home because of temperature variations.  At a minimum, a safe deposit box is cheap and acceptable because of the relatively constant temperature.

    If you're attempting to save money by writing to the same tapoe over and over, consider the increased chance of production loss, tape head wear from wiritng to the same tape continuously, and not keeping the data offsite.

    No one plans on fires, floods, or disasters, but they occur.  If your backup data is destroyed along with your production data, where will you be?
    LVL 30

    Assisted Solution

    by:Duncan Meyers
    Yes and no...

    If you have budget constraints or a smaller network where the potential loss of up to four days data is acceptable (and that's the $64K question for the guy that signs the cheques), or there is no-one at the site who can (or usually, will) change the tapes, then appending a daily incremental is fine. However, as gpriceeeeeeeee notes, best practice would have you rotating your tapes and keeping copies offsite. If time and finances permit, a ful backup every day is the best possible approach as it saves time in the event of a disaster recovery restore. If not, then either a daily differential backup (preferred for the reduced restore time) or a daily incremental backup will do nicely.

    Finally - its a truism taht you don't have a backup until you've tested that you can restore from the backup tapes. You should plan for a regular test restore and disaster recovery test if possible.

    So, there you go - one of each possible answer :-)

    Author Comment

    Thanks guys,  I feel more comfortable about my decision.  We have 2 tape backup drives and 1 does full backups on my business critical stuff and the second backups user files and such.   I think i'll just continue with 2 full backups, incremental felt like a good idea on the user files, but like you all said restoring is the key and it will be much faster that way.
    LVL 57

    Expert Comment

    by:Pete Long

    Featured Post

    Highfive Gives IT Their Time Back

    Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

    Join & Write a Comment

    A Bare Metal Image backup allows for the restore of an entire system to a similar or dissimilar hardware. They are highly useful for migrations and disaster recovery. Bare Metal Image backups support Full and Incremental backups. Differential backup…
    The Delta outage: 650 cancelled flights, more than 1200 delayed flights, thousands of frustrated customers, tens of millions of dollars in damages – plus untold reputational damage to one of the world’s most trusted airlines. All due to a catastroph…
    This video teaches viewers how to encrypt an external drive that requires a password to read and edit the drive. All tasks are done in Disk Utility. Plug in the external drive you wish to encrypt: Make sure all previous data on the drive has been …
    This tutorial will show how to configure a single USB drive with a separate folder for each day of the week. This will allow each of the backups to be kept separate preventing the previous day’s backup from being overwritten. The USB drive must be s…

    746 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    15 Experts available now in Live!

    Get 1:1 Help Now