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Full, Incremental and differentail backups

Posted on 2006-11-24
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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.
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Question by:arahming
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Pete Long earned 500 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
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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
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by:arahming
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Thanks Pete I guess I should have look through an old MS book for backup 101 or something....

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