Hmm... that's not very user-friendly, although hopefully infrequent.
What version of TILP and GFM did you use when making the backup, and what version are you using now ? What calculator model (maybe 84+SE, if your profile's picture is any indication ?) and OS version(s) ?
Also, even if these are less relevant for debugging that particular problem than the TILP / GFM and calculator OS versions, I'd like to know the remaining usual basic pieces of information:
* the cable type you used for transfer;
* while at it, the computer OS type and version.
You should attach the backup file to a post, so that people can have a look at it