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Burstar1 t1_jd2u7uy wrote

All the information it is possible to glean or infer from a file outside its actual contents. Things like:

File type, size, time and frequency of use (importance), the IP address/location of the user and anyone it has been shared with, the language it uses, etc...

Without even a database of all your data, it is possible to look at a large spreadsheet file and make an educated guess whether or not it is an important file whose user is educated, Western (based on language preference) and likely middle-aged (Excel vs. Google Spreadsheet), who is using it for budgeting or database purposes (based on size and frequency of use).