Solved

Full Backup /w Archive bit Backup Question

Posted on 2009-04-06
6
334 Views
Last Modified: 2013-12-01
I need clarification on a specific backup scenario  Our drive storage unfortunately exceeds our backup tape capacity @ 20gigs.  This makes me have to replace a tape 2 to 4 times to do a full backup, and then if I have it on "verify", I'm popping the tapes in and out like 4 to 8 times total.  

This is extremely time consuming, so I have thought of a new plan.  Will this scenario work:  Full backup w/resetting archive bit on Drive X with one tape and do another Full Backup w/ resetting archive bit on Drive Z, and so on with other Tapes and Drives.  I then want to have a differential backup tape that backups both Drive X and Drive Z and possibly the other drives.  Will this work?  My fear is that the differential won't backup the correct files since I reset the archive bit at different times on the two drives.

Thanks

0
Comment
Question by:T0DD
  • 3
  • 2
6 Comments
 
LVL 16

Expert Comment

by:glenn_1984
Comment Utility
Simpler:

Backup OS and Program Files (static files) on weekends.
Backup data on week days.

If Data alone still is more than one full tape...make sure your compression is on and working.
0
 

Author Comment

by:T0DD
Comment Utility
Data is about 60 gigs.  I usually do a Shadow Copy monthly.

I guess I just need clarification that when you choose to reset the archive bit with two separate jobs, with two different drives and then choose to run a differential that encompasses both drives, will the correct information get backed up?

Thanks,
0
 
LVL 16

Expert Comment

by:glenn_1984
Comment Utility
Your archive bit method sounds subject to error over the long term.
Why not test it on a data  subset, then implement it if works.
0
6 Surprising Benefits of Threat Intelligence

All sorts of threat intelligence is available on the web. Intelligence you can learn from, and use to anticipate and prepare for future attacks.

 

Author Comment

by:T0DD
Comment Utility
Would I like to know if anyone has tried this over the long term.  I know if I test it, I'll get results but long term examples is what I'm looking for.

Thanks,
0
 
LVL 10

Accepted Solution

by:
itprotocall earned 250 total points
Comment Utility
"My fear is that the differential won't backup the correct files since I reset the archive bit at different times on the two drives."

archive bit is not time-dependent so the fact that the two drives' full backup was done at different times will not affect the data that gets backed up. whatever files changed after they got backed up will be included in teh differential.

example:
8AM - Drive X full backup - the archive bits for all the files are cleared
8 PM - Drive Y full backup - archive bit cleared for all files

now suppose you do a differential backup 8 AM next day:
for Drive X - whatever files got altered, added in last 24 hours will have archive bit set - these are included in the differential backup
for Drive Y - whatever files got altered, added in last 12 hours will have archive bit set - included in differential backup.

as you can see in the example, the number of files backed up in the Drive X's differential may be higher than the number of files in Drive Y's diff backup... (that also depends on your 'rate of change')

bottom line is you do not need to worry about the 'correct' files being backed up as the file attribute of 'archive bit' is handled by the windows file system and is quite reliable.

hope this is clear.


0
 

Author Closing Comment

by:T0DD
Comment Utility
Exactly what I was looking for.  Thank you!
0

Featured Post

Why You Should Analyze Threat Actor TTPs

After years of analyzing threat actor behavior, it’s become clear that at any given time there are specific tactics, techniques, and procedures (TTPs) that are particularly prevalent. By analyzing and understanding these TTPs, you can dramatically enhance your security program.

Join & Write a Comment

Suggested Solutions

Problem We are doing a daily copy of data in file system in Linux manually and I want to automate the same . We need many features in this automation:    1. We want to be able to exit in case of errors    2. We want the copy to happen via …
How to fix error ""Failed to validate the vCentre certificate. Either install or verify the certificate by using the vSphere Data Protection Configuration utility" when you are trying to connect to VDP instance from Vcenter.
This tutorial will walk an individual through the steps necessary to install and configure the Windows Server Backup Utility. Directly connect an external storage device such as a USB drive, or CD\DVD burner: If the device is a USB drive, ensure i…
This tutorial will walk an individual through setting the global and backup job media overwrite and protection periods in Backup Exec 2012. Log onto the Backup Exec Central Administration Server. Examine the services. If all or most of them are stop…

771 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

11 Experts available now in Live!

Get 1:1 Help Now