1, turn off the unnecessary protection drive
Click on the "Control Panel"-"System, and then select System Protection, the default is all drive system protection, to turn off some unnecessary drive protection, to reduce the backup space footprint. However, Windows 7 does not allow you to protect only the non-system drives, not the system drives, so as long as you turn on system protection, you must first turn on the protection system disk.
2, adjust the amount of disk space used
System disk By default occupies the maximum space 3%, the general default can be, no matter how much, the system disk to reserve at least 1G of disk space, or restore operation will not be carried out.
Instead of the system disk, which takes up up to 30% of the maximum space, can be adjusted according to the actual partition size, if the drive contains important files, or reserved for Windows 7 use it, perhaps the key time.
2, delete the early restore point free space
Please note: You cannot delete individual restore points, either by removing all restore points (which can be removed in the System Protection window) or by removing all restore points except the most recent restore point (only in Disk Cleanup-more options-"System Restore and Shadow copy"). Removing a restore point effect only temporarily frees up disk space, and subsequent creation takes up this portion of disk space. It ultimately relies on the system to protect disk space settings.
Note that when you delete a restore point, the previous version of the file is deleted, and if you back up some important files at the same time, you may not be able to restore the version again, so the "delete" all restore point buttons in the figure above should be used with caution. The following figure the Disk Cleanup grab is from the Windows 7 English version of the Chinese Language pack display results, the actual Chinese version may be different.
Second, adjust Windows 7 automatic backup footprint
Note: If you have not set up a scheduled backup, you will not see the "Manage Space"