How can I increase the space used by Windows 7's backup feature?

I have it configured to save the backups to a separate 100GB volume but the backup feature only wants to use at most 30% of the space. I could tell it to delete older backups as a temporary solution but this is not really desirable.

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You might mention what backup software you are using. – Moab Sep 18 '10 at 23:47
All the answers given as far, here and otherwise, are not helpful. None makes the 30 percent limit increase to say 100 percent. Most just tell the obvious thing, that is how to delete old backups. – user72588 Mar 20 '11 at 11:35
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3 Answers

I could be wrong here, this is not Windows Backup exactly, but System Protection, however this is the only one that I know of that limits you - Windows Backup as far as I know has no limits to what it can use.

Click the Start Orb, right click Computer, click Properties.

On the left hand side click System Protection.

Click on the drive you want to increase the percentage and then click Configure.

Move the slider up.

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I hope this helps, but if I have got it wrong, let me know.

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I tried it but it doesn't work, it seems that what I want to do can't be configured from their UI. – suihock Sep 20 '10 at 8:26
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You can change the backup space used

To view and manage your backup disk space

Open Backup and Restore by clicking the Start button , clicking Control Panel, clicking System and Maintenance, and then clicking Backup and Restore.

Click Manage space. If you're prompted for an administrator password or confirmation, type the password or provide confirmation.

Note

If you haven't set up backup, you won't see Manage space.

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Source

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The 30% space limit is the default amount of space set for system images (shadow copies, the same technology behind System Restore points). Try opening System Protection as Wil mentioned, select the backup drive, click Configure, and move the slider from 30% to the amount of space you want to use for system image backups.

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