Differential Backup on Home 11.0

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Win XP Pro - Backed up to 500 GB Ext. HD - Novice User: I have always used Incremental backups, but recently switched to Differential after reading the benefits. I thought I read that the Differential method checked for differences between the original Full backup and created a Differential backup showing the changes.

I noticed that every day I have two new Differential backup files, but the older Differential files are also there. Do I need the older Differential files? At two a day, they accumulate quite rapidly over a month.

Question #1: Can I delete the older Differential files or are they also needed?

Question #2: If the older Differential files are not needed, is there a way to automatically remove them when the new Differential files are created each morning?

I appreciate your help.

sam 10/07/2010 - 20:27
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1. Differential files cam be deleted as you wish.
2. A better option would be to consider using the free helper program Chain2Gen. Click my signature link for more info. TIH does the scheduling and performs the backups. Chain2Gen does the control of how many to retain, etc.

dim 11/07/2010 - 13:34
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Thanks, GroverH. So, any differential files previous to the most current one are not needed; is that correct?

Sorry, I am a novice and am just trying to clarify your comment.

dim 11/07/2010 - 17:02
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A differential backup contains all changes made since the last full backup. In order for any differential to be restored, all it needs is the original full backup plus any single differential that you choose.

Sunday--full backup
Mon-diff1--All changes since Sunday full
Tue-dif2--All changes since Sunday full
Wed-dif3--All changes since Sunday full
Thu-dif4--All changes since Sunday full
Fri-dif5--All changes since Sunday full
Sat-dif6--All changes since Sunday full

In order for any differential to be restored, all it needs is the original full backup plus any single differential that you choose.
Of course, keep in mind that if you choose to delete earlier diff file, you won't have what the content was before the change--only the final result. For example, lets say you edited a file and deleted a paragraph on Thursday and then took a new diff backup. A restore of the newest diff file will show that the paragraph is gone but you would need an earlier diff file to know what the content was of the paragraph that was deleted.

In the above example, you could delete all but Sat-dif6 and the missing files would not affect your ability to restore the diff6 plus the required original full backup.

An incremental type backup to be restored needs not only the first full backup but all prior incremental. If you wanted to restore inc7, you would need to retain inc2-6 as well.

dim 11/07/2010 - 17:47
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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Thanks for being so patient with me. I thought that is what you meant, but when dealing with backing up my hard drive, I felt it would be better to be safe than sorry.

dim 11/07/2010 - 22:44