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WHY - Why - Why Do i have to do a FULL backup to do an Incremental

Created: 25 Mar 2013 • Updated: 22 Apr 2013 | 9 comments
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WHY - Why - Why Do i have to do a FULL backup to do an Incremental?

I just upgraded to BE 2012 and when creating backups they all come in already with a FULL backup which does not have an opton to delete it.   All I want to do is an incremental backup do not want a Full backup.  How can I prevent this from occurring or delete teh Full backup out of my new backup job?

 

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CraigV's picture

Hi,

 

You cannot do an INCR backup without doing a FULL backup. Every single backup software works this way. The FULL backup acts as a baseline from which the subsequent backups run. It is not possible to just do an INCR backup, or even a DIFF backup for that matter.

Thanks!

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SOLUTION
SuperBrain's picture

Well.. earlier versions of Backup Exec used to allow create "just" an Incremental backup job or "just" a differential backup.

 

But, in a lot of cases, that used to create problems. Mainly due to users creating just the incremental backup job by selecting a different selection list thn the one being used to Full. Jobs used to fail.

Backup Exec 2012, by design, creates all backup jobs as policy backups. Hence, each job can have its own set of backups (full / incre / diff) with Full being a mandatody backup (of course due to reasons CraigV mentioned above).

This behavior of Backup Exec 2012 cannot be changed. You need to have Full and Incremental both in the same job configurations i.e. using the same selection list.

TucanSam's picture

So All I need is an incitial FULL backup and then i can delete the FULL fromt eh job?  That is what you are saying.  If I get one FULL backup then should not need anymore and can do only INCR from then on?

 

So once I run a FULL I can delete it from teh job?  I do not need a Full to run and take up space for no reason.

CraigV's picture

Um, You need a full backup. Are you going to do INCR backups into infinity? Not possible...you need a FULL backup at some stage.

Read the Wikipedia link below:

http://en.wikipedia.org/wiki/Incremental_backup

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Colin Weaver's picture

One of the most common reasons (across all versions of Backup Exec)  that someone running incremental backups may not be able to restore when they need to is loss of either the full or an incremental set that is part of the sequence.

To avoid this sort of problem we do not recommend running "incrementals for ever" as such you should run a reasonably regular full backup and we have specifically coded Backup Exec to require a full before you can run an incremental

TucanSam's picture

I see, but seems as thought Symantec is telling us how to run our backups/company instead of giving us the tool to do as we see fit and able to do what we want.

 

Now I just need to fit the 5 FULL backups of 9 TB of data to get me started - thanks should be able to fit that in really easy in no time.

CraigV's picture

...But your FULL gets overwritten, so you don't have multiple copies. Like I said, your FULL is a baseline. How do you expect an INCR/DIFF job to be run from nothing on which to base subsequent backups? Veeam have INCR forever if need-be, but you still need a FULL, and once your rollbacks are hit, you need another FULL which overwrites the previous copy.

IBM's Tivoli Storage Manager does INCR forever, but it needs a FULL backup on which to base the INCR...etc. for CA ARCserve etc.

Symantec might be using INCR instead of DIFF (from what I see) but they aren't forcing you to use this. There are complete FULL backups, Deduplication backups etc...

Thanks!

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TucanSam's picture

And also we are talking about Increamentals not Differentials and if a company needs INCR from a set time and that is it - should not req a FULL backup to do so.

CraigV's picture

*sigh*...do you want a car without an engine? 1 doesn't work without the other. It's the same analogy. DIFF was included because it follows the same purpose and way of backing up...a FULL backup is required to set a baseline.

I guess you should go blame the person/people back in time who decided that DIFF/INCR backups actually needed a baseline FULL backup before blaming Symantec...wink

Over & out...

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