TL:DR
TIB files are an Acronis True image artefact.
And I agree with whoever first wrote that vanilla copies of the folders and files are heaps better than proprietary backup formats. Best way to do it is with a folder/file synch tool - best because:
- its fast (after first sync) which means you have no excuse for not doing it frequently,
- individual items can be restored,
- the backup copies can be used directly (i.e. a calibre library backup can be used by calibre as-is, in-place)
- its not application specific, so you can use the same tool to backup all your data
BR