As we known that there is no UI for user to configure Image backup in Windows 8.1, this is a guide for your to schedule multiple versions of System Image Backup.
Step 1: Create a task to schedule an image backup with following command:
SCHTASKS /Create /SC WEEKLY /D MON /TN WeeklyFullBackup /RL HIGHEST /ST 13:00 /TR “wbAdmin Start Backup -backupTarget:F: -include:C: -allCritical -quiet”
Step 2: Schedule a robocopy to backup the saved image with BAT file:
- Please create a new folder (in this example, the new folder is e:\test2) to save your multiple copies of image backup:
- Write following batch file to copy backup and rename with backup date:
*****************BAT********************
@echo off
robocopy e:\test1\ e:\test2\ test.wim
ren e:\test2\test.wim test_%date:~10,4%%date:~7,2%%date:~4,2%_%time:~0,2%%time:~3,2%.wim
*******************************************
NOTE: e:\test2 is my location to save multiple copies of image backup; e:\test1 is the location I create the system image backup.
This BAT can also help to rename the copy of image backup with date and time like below:

3. Set up a basic task in Task schedule:
Note: please make sure the time you configured follows the time you set for image backup in Step 1.
Action -> Create basic task (Name you task) -> Trigger (Set how often this task should be run) -> Action (Start a program) -> Under Program/script, point to your bat file you create in Step 2.b -> Finish
At the end, you can know more about SCHTASKS and Robocopy via following links:
Robocopy
http://technet.microsoft.com/en-us/library/cc733145.aspx
Schtasks
http://technet.microsoft.com/en-us/library/cc725744.aspx
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