How to increase the maximum number of Report Snapshots that can be saved
Open TIPHOME/products/tcr/conf/reportingConfig.xml and locate the following property near the top in the second stanza of the global parameters section:
As you can see, the default maximum for the value of the number of snapshots that can be saved is 20. Set this to the desired number. There is no theoretical maximum, but keep in mind sizing of the snapshots when setting it.