?
Solved

Full, Incremental and differentail backups

Posted on 2006-11-24
4
Medium Priority
?
251 Views
Last Modified: 2010-04-14
Okay, I was trying to ask this question before but i guess asked it in the wrong way. We have CA Archserve and i am being told there is a way to set an incremental backup so this it will do this. In the given scanrio we have several 100 GB hard disk that backup the server daily we also have on 70 GB rev drive. We will be backing up everything to the external disk and doing a monthly rev backup. Anyways I am being told that we can make the backups run so that we have the same backup doin incrementals which will save a copy of both the changed file and the old file and we can extract it from those backups without changing the media. in other words we can leave the same media conntected to the machine and have it backup incremental until we needs something. Say someone says they deleated something 13 days agao and this media has been running the same incremental backup. According to what i am being told we can open arch serve and go back 13 days it will look at the media which has the backup on it and go back 13 days allowing us to retieve the file. I was under the influence that the change would be the file deleation and the incremental would remove the file.
0
Comment
Question by:arahming
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
4 Comments
 
LVL 57

Accepted Solution

by:
Pete Long earned 2000 total points
ID: 18010884
Errm there are three (well four if you count copy) types of backup - They all make use of every file and folders archive bit its either on (set to 1) or off (set to 0) - access in or changing a file/folder turns on the archive bit (think of it as a digital switch that says "I need to be backed up cause Ive changed"

How They Work

Type 1 Full Backup - backs up everything regardless of how the archive bit is set and turns OFF all the archive bits on every file and folder.
Type 2 Differential backup - backs up everything thats changed since the last FULL backup (by backing up everything with the archive bit turned on) it makes NO CHANGE to files and folders archive bits as it does this
Type 3 Incremental Backup - backup everything  that has changed since EITHER the last full backup OR the last incremental backup.

So to restore files Folders

Full Backup: You only need one tape (or set of backup media to restore anything)
Differential: You need the last full backup and the last differential backup made since that full backup.
Incremental:  You need the last Full Backup and EVERY Incremental backup since that full backup
0
 
LVL 57

Expert Comment

by:Pete Long
ID: 18010899
To Apply these in ARCserve -

Open ARCserve system manager
If you are editing an existing job select "Job Status" Select the job > Right Click it  > And select Modify Job > Select the Scheduling Tab
If you are creating a new job Select "Backup" set the backup you require then select the scheduling tab.
On the Scheduling In the "Repeat Method" Change it to days of the week > Select the days you want the job to run.
Below this You can set the option of Full-Keep the archive bit (This is the same as copy which I mentioned earlier), Full Clear the archive bit (This is a true full backup), Incremental or Differential.

Using this you can set a Full backup (clear the archive bit) on a Monday then an Incremental (or differential) job to run on Tuesday through to Friday for example
0
 
LVL 1

Author Comment

by:arahming
ID: 18011119
Thanks Pete I guess I should have look through an old MS book for backup 101 or something....

0
 
LVL 57

Expert Comment

by:Pete Long
ID: 18011122
No Problem - Glad to help - and ThanQ
0

Featured Post

Want to be a Web Developer? Get Certified Today!

Enroll in the Certified Web Development Professional course package to learn HTML, Javascript, and PHP. Build a solid foundation to work toward your dream job!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

NTFS file system has been developed by Microsoft that is widely used by Windows NT operating system and its advanced versions. It is the mostly used over FAT file system as it provides superior features like reliability, security, storage, efficienc…
This article will show how Aten was able to supply easy management and control for Artear's video walls and wide range display configurations of their newsroom.
If you’ve ever visited a web page and noticed a cool font that you really liked the look of, but couldn’t figure out which font it was so that you could use it for your own work, then this video is for you! In this Micro Tutorial, you'll learn yo…
Add bar graphs to Access queries using Unicode block characters. Graphs appear on every record in the color you want. Give life to numbers. Hopes this gives you ideas on visualizing your data in new ways ~ Create a calculated field in a query: …
Suggested Courses

801 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