Unable to change the retention. of \\?\VOLUME{EF429E72-C546-11E3-8411-806E6F6E6963}\

Hi experts,

We are changing the retention on the FS backup savesets. mention in below snip

 

I am unable to change the retention for   \\?\VOLUME{EF429E72-C546-11E3-8411-806E6F6E6963}\ saveset: error is mentioned in the snip

 

Kindly help us to solve this.