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Topic Title: Incremental backup everyday and full backup every weekend?
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Created On: 21-May-2004 22:06
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Answer This question was answered by Catherine Yan, on Friday, March 11, 2005 4:57 PM

Answer:
Hi Cory,

Will the links be restored too this way?

Thanks!
Catherine
 21-May-2004 22:06
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Lillian Kelly

Posts: 6
Joined: 9-Dec-2003

We are just starting to use DOORS and in the process of setting up a backup recovery plan as well as disaster recovery plan. Our goal is to restore 100% of data each time and every time. What is the best practice from the collective? What is your backup frequency in doing full backup vs. incremental backup? Thank you for your inputs in advance
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 24-May-2004 13:17
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David Rose

Posts: 80
Joined: 10-Oct-2003

We do a full backup every night. I wish I could tell you why, but the policy was in place when I got here. We have been fortunate that we haven't had to use our backup since I got here, 16 months ago.

-------------------------
David A. Rose TSgt USAF
NCOIC System Administration
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 25-May-2004 15:04
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Cory Hug

Posts: 20
Joined: 30-Sep-2003

Check out this thread in the Enterprise Operations forum:

Resilient DOORS Setup

Bottom line, you can do incremental backups, but if you do a restore you MUST do a "point-in-time" restore so that the ENTIRE data directory, all files and all subdirectories, are restored to exactly as they were at a particular point in time. You can't just restore a specific subdirectory or specific file.

So as far as how often to do a full vs. incremental, that depends on how many incrementals you want to have to go back through to do that point-in-time restore. If you have an automated tape system, you can probably spread it out. If you have to change tapes manually, you might want to limit it to fewer tapes and do full backups more often.
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 26-May-2004 16:15
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Brian Azelborn

Posts: 36
Joined: 2-Dec-2002

We do full backups on Wednesday nights (I don't know why that day was picked), and incremental backups on every other night. We have had to recover data numerous times since we started using DOORS.

You can restore a specific module as long as you know what directory contains the module. You can figure that out using a script that lists the physical directory names. We got the script from our Telelogic representative - you should be able to get it from yours. If the recovery you need to make is restoring a module that has been deleted and purged, it is much more complicated because there are files that tell DOORS that the module exists that need to be updated and there is no easy way to determine which directory used to contain the module information. In this case, it is much easier to restore the entire database.
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 26-May-2004 16:23
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Cory Hug

Posts: 20
Joined: 30-Sep-2003

In the latter case (need to restore a deleted module), the general process is to restore the entire database do another location, (like a standalone test machine), then archive the module from the restored copy, then reimport the archive into the life DB.

Technically, I believe that's the way you're supposed to recover any project or module (whether it's been deleted or just need to revert to an older version), but if you're confident in the ability to restore a module directly from tape if you know what directory it's in, then go for it.
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 26-May-2004 23:19
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Faisal Zahidi

Posts: 8
Joined: 26-May-2004

we perform full backup because it is hard to restore link files from a increamental backup. Please also keep in mind that DOORS services should be turned off during backup takes place. Otherwise the backup system will not backup any modules which are opened by the users during the backup time. I would strongly suggest you to perform full backup.

thanks
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 30-Sep-2004 20:24
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Wendy Hopper

Posts: 4
Joined: 5-May-2003

I thought that Telelogic recommended differential backups, and discouraged incrementals. We had a bad experience restoring from incrementals.
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 1-Oct-2004 12:52
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Mikael Bendtsen

Posts: 11
Joined: 18-Feb-2003

Yes, differential backups is the way to go. Incremental backups are not recommended.

If there is someone who needs to know the difference between the two:

An incremental backup clears the archive bits each time data is backed up. This means that each backup will be small. To perform a restore, a copy of the last full backup and each incremental will have to be restored to get all files to their last known state. In most cases, a full backup will be performed weekly while an incremental backup is performed daily.

A differential backup clears archive bits only after a full backup. This means that daily backups get gradually larger, but restore is easier. A full restore only requires the last full backup and the last differential.

Incremental backup allows for a more granular restore, but differential backups are typically easier to restore.
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 1-Oct-2004 14:26
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Mandy Livingstone

Posts: 15
Joined: 21-Jan-2003

Chapter 5 of Managing DOORS covers backups - we in Telelogic recommend differential or full backups, as the most recent posts to this thread have stated

A reminder to users that any manipulation of raw DOORS data should only be done in conjunction with your local customer support department.

Mandy
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 4-Oct-2004 16:42
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Catherine Yan

Posts: 43
Joined: 4-Aug-2003

Answer Answer
Hi Cory,

Will the links be restored too this way?

Thanks!
Catherine
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