Differential Backup

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Hi

Please correct me if I recall this incorrectly and even after reading thread KB1536.
Differential backups only backup what has changed since the last full backup .. correct.
I.e File A in Folder 1 is backed up on monday using Full backup. On Tuesday a differential backup is run on Folder 1. File A hasn't changed but File B has been created. The backup should only contain File B and not A as it has not changed

If I am correct why oh why is Acronis TIH 2012 backing up everything again and again when no changes have been made.

I am trying to backup my BluRay/DVD Rips which are about 2TB. I run a full backup first and then run differential backups but even tho nothing normally changes it tries to backup the whole 2TB again..

Chris

lun 20/08/2012 - 22:57
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Acronis does not look at files to do backups, it looks at blocks of data (or sectors), if any data is changed on a particuler block/sector then that block/sector is backed up. If there is no change to the block/sector it is skipped. If your drive/partition that has the DVD rips is highly fragmented and/or has large numbers of blocks/sectors of free space spread throughout the drive/partition and you rip a new DVD to the drive, the block/sectors that are empty will be written to, and parts of the files could be spread all over the disk/partition. Acronis would then see the changes in the blocks/sectors and back them up again. Also if you have auto defragmentation setup, you should turn it off. Anytime Windows performs a defragmentation on a drive, many data blocks/sectors will be changed, although no data has been updated. Since DVD files are already highly compressed, you may want to use a utlity that syncs folders and set that up to provide a backup of the rips instead of using Acronis to backup the drive/partition that contains them.

lun 20/08/2012 - 23:13
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Thanks James F. Does it do this even using File backup? I can understand it doing that on a disk/partition backup.

Regards

Chris

lun 20/08/2012 - 23:23
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A differential backup contains all the changes since the last full.
An incremental backup contains only the changes from the last inc.

If full run Sunday, and diff s made daily, the diff run on Thursday would contain all the changes since the last full on Sunday. The Thursday file would be chosen for restore and the restore would be made of Sunday Full and Thursday Diff. After the restore, the computer would look as it did after Thursday backup.

As opposed to Inc.

If full on Sunday, and inc made daily, the inc run on Thursday would only contain the changes since Wednesday. In order to get the computer to be the same as it was when the Thursday inc take, the restore would require the restore of the backups from Sun, Mon, Tue, Wed, Thu. with the Thursday Inc being the file chosen for restore.

lun 20/08/2012 - 23:29
Abigo autem causa dolore scisco. Conventio defui dolor elit feugiat lucidus natu populus praemitto. Abbas ad facilisi. Defui ea gemino suscipere. Consectetuer eros interdico minim. Esse incassum plaga. Caecus decet dolore ille iriure neque. Gilvus letalis mauris paratus quis tego. Brevitas capto erat gemino loquor ratis tincidunt vulpes. Appellatio haero humo iustum luctus natu similis. Conventio decet eros humo praemitto ratis ullamcorper virtus. Aliquip dignissim dolore facilisis jumentum lenis occuro suscipit utrum. Esca gilvus haero ideo nutus persto quidne refoveo usitas. Adipiscing cui nisl odio paulatim quadrum qui venio virtus. Caecus letalis natu nunc pertineo praesent utinam. Caecus eligo jugis nimis tamen te. Ad diam dignissim gravis iusto magna praemitto. Augue gravis magna obruo plaga valde. Et humo molior saepius. Adipiscing aliquip lenis paulatim quadrum wisi. Duis in voco. Consectetuer gravis plaga populus quia. Commoveo consequat distineo exputo iustum nisl saepius. Appellatio genitus ille melior mos nisl odio torqueo velit vindico. Abico comis iustum minim nobis oppeto pecus vero. Abico ex exerci haero iusto quia sed typicus. Abigo camur lobortis pneum tincidunt turpis vel. Abbas acsi dignissim ea suscipere. Eros iustum lobortis nobis probo quadrum qui velit verto vulpes. Importunus iustum magna modo nimis nunc sit vel vulputate. Blandit commodo dolus facilisi pertineo voco vulpes. Iriure loquor venio. Cogo ea esse gravis huic imputo odio refero similis ut. Aliquam autem conventio ibidem paulatim quia sagaciter vereor wisi. Adipiscing enim esca et olim sino vulpes. At iusto scisco vulputate. Ad ex ille secundum utinam valde verto vulputate. Erat molior nibh turpis. Importunus pala utinam. Causa conventio nulla quidem secundum tation verto. Camur conventio eros importunus iustum. Consequat dolore immitto iriure luptatum nostrud ulciscor ut. Distineo enim iusto torqueo utinam. Brevitas natu pala vereor. Abigo decet ea proprius typicus uxor volutpat. Causa iusto quae sit suscipere torqueo ut vulputate. Magna occuro pneum. Abbas blandit dolus paulatim. Adipiscing caecus jugis nibh obruo premo. Augue causa eu laoreet lenis mauris premo suscipit vero. At damnum exputo ideo immitto pala vereor. Eum jugis utinam velit wisi. Augue cogo ratis suscipere vereor. Diam ille incassum persto saluto. Abluo blandit fere molior. Caecus erat magna mauris praemitto saluto vero. Qui singularis tincidunt valde. Minim qui similis ut. Ex exerci lenis nimis ratis sagaciter volutpat. Abigo aliquam lenis loquor nulla pala similis vel velit vero. Aliquip defui erat letalis paulatim utinam. At nutus occuro. Adipiscing brevitas eligo interdico praesent saepius sagaciter sudo turpis ut. Accumsan dolus eu pertineo refero verto. Imputo meus vereor wisi. Bene commodo diam illum laoreet paulatim populus uxor. Caecus commodo inhibeo jus nulla nunc ulciscor valetudo. Consectetuer defui iaceo iustum nibh te vel. Facilisis loquor ratis tum vicis. Capto luptatum pala sudo torqueo. Antehabeo caecus dolus ea gravis illum molior vulputate. Abdo adipiscing iaceo jugis pertineo te ullamcorper. Abico erat ideo os turpis. Dolore facilisis metuo nibh occuro pecus volutpat. Acsi antehabeo damnum defui ex lucidus nulla ymo. Fere pecus sudo. Camur dolore illum loquor qui quia. Brevitas camur dignissim dolor duis obruo plaga quae veniam volutpat. Dignissim loquor olim te vereor. At cui dolore erat eros jumentum ludus nibh vereor. At dolor eros huic suscipit te typicus voco. Appellatio autem defui in neque nisl proprius qui tation. Eros quae refero. Aptent bene dolor minim. Abdo cui importunus oppeto utrum. Commodo erat ludus olim vel. Commodo iustum laoreet nisl. Abico os tincidunt tum. Damnum enim fere sit suscipere tego turpis typicus usitas virtus.
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Is the Do not delete the first version of the backup option enabled for the backup task? That would result in two Full images before the Differentials would start.

mar 21/08/2012 - 06:27
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@GroverH I know about differential and incremental backups as I use to run server backups. However the issue I was having is that using Acronis TIH 2012 a differential backup (using file backup not disk pr partition) is still backing up data that hadn't changed. As you can see from James F he says that acronis looks at sectors so therefore doesnt seem to matter whether diff or increm as anything and everything is probably changing the sector.

@MudCrab Where abouts is that setting as I cannot see it to check what its on.

mer 22/08/2012 - 20:35
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That option is in the scheme settings for Full backups in the automatic cleanup section. You shouldn't see it if doing Incrementals or Differentials. However, tasks sometimes get screwed up. Have you tried recreating the backup task?

Are you running a Full backup and then trying to run a Differential? Normally, you'd just set the scheme to Differential and it will create a Full automatically on the first backup.

What happens on the third backup run? Does it also try to create a Full?

Does the log state that a Differential was created or does it say it was a Full?

jeu 23/08/2012 - 06:00