Suddenly T.M. posted 'delayed' when backing up to an external 250 gb drive. I have deleted perhaps 10 old back-ups but freed up space does not show on T.M. Shows 47 gb of space out of of total 214 gb. How can I get this freed up space to occur? Running OS 10.6.8. 2.33 ghz Core 2 duo. Thanks for any assistance.