It would be awesome if we can see the currently saved shsh2 blobs and the signed versions (using ipsw.me API)
Something like this:

A check can be added to compare the ipsw.me data with tsssaver data and either shows a message indicating whether all signed versions are saved or disable the 'save blobs' button if they are saved.
Obviously, If you considered adding the feature you should come up with a better design than my shitty one, I just did it by screen shooting in under a minute :)
Thanks