Windows 8.1 System Image Backup

I have 2 questions about Windows 8.1's System Image Backup:
I run this command: wbadmin start backup -allCritical -vssFull -quiet -backupTarget:E:\
1. Why does this backup take 36% more space than the data on source disk? (Acronis backup takes much less.)
2. I find data of only one backup while the command is supposed to do incremental backups as well. How to do backup of more than one day?


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JohnBusiness Consultant (Owner)Commented:
For number 1, Acronis may be using compression in a different way to wbadmin.

For number 2, there is a good explanation in the following Microsoft thread. It talks about Windows 8 doing full backups. Have you tried providing more space and backing up to a different location?
AkulshAuthor Commented:
1. So Microsoft cannot do compression, while Arconis can. Disappointing and surprising.
2. I looked thru that thread about Win2008-R2 backup. It has so many postings and no clear cut solution that I could discern. My target disk has plenty of space for incremental (more than 30%) but not for another full. No, I have not tried a different location.
JohnBusiness Consultant (Owner)Commented:
For Windows Backup you need enough space for ALL the backups or it will not do them all. So that is your answer here:  Provide more space.

Consider backing up to a Large USB Hard Drive (2 TB or more). That should definitely allow more backups.

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AkulshAuthor Commented:
What do you mean by "ALL the backups"? Is there a fixed number? If there is room for one Full and 3 Incremental backups, then those 3 should be done, right?
Are you sure the command I am using, or any other command, would do incremental backups?
I will try a larger disk in a few days.
JohnBusiness Consultant (Owner)Commented:
I think if you allow room for 3 backups, it should do them all and identify by time/date and possibly name.
AkulshAuthor Commented:

It is only doing one full backup, so my main question (2nd) remains: Will the command I am using, or any other command, do incremental backups?

I will try a 2TB disk in a few days. My data is only 120 GB. Thanks for your time.
David Johnson, CD, MVPOwnerCommented:
Windows 7 backup aka windows backup does an initial full and then incremental for 14 days and a new full every 15 days. The image is a .vhd with a size limit of 2TB
AkulshAuthor Commented:
My question is about Win 8.1, not Win 7.
David Johnson, CD, MVPOwnerCommented:
Windows 8.1 calls it Windows 7 backup in the GUI
AkulshAuthor Commented:
Where? What GUI? Not in Control Panel... Nor in the Search
David Johnson, CD, MVPOwnerCommented:
My bad, Windows 8.1 changed the name to 'create a system image backup' control panel | file history | look in the bottom left.
System Image BackupSystem Image Backup GUI
AkulshAuthor Commented:
I was not asking about this. I know it very well and am using it. Please read my question, part 2. Thanks.
JohnBusiness Consultant (Owner)Commented:
Have you tried providing more space for backups? That may solve your issue.
AkulshAuthor Commented:
I will be able to do the testing this weekend. Have the 2 TB drive. Will update...
AkulshAuthor Commented:
Windows System Image backups to 2 TB disk do have backups of many days, so incremental backups are working. The problem was lack of space (3Ximage is not enough). Thanks.
JohnBusiness Consultant (Owner)Commented:
@Akulsh  - Thanks for the update and that is good news that the added space got your backups working.
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