please tell me about the empty folder again

do you mean when putting file into the folder you could not do if folder was empty

or do you mean when putting a file into a folder and the folder was not there

as for the data in files

do you mean if data in the file you are about to copy

or do you mean if the data exists in the file you are about to replace

and finally

the age of source files

the way to check the age of the files will vary due to how you save that date

if you vary the version number of a file then that is clear in the name of the file - no fancy filersystem stuff to review

if it is on date of production that could be in the name too or in the header of the file (1st record)

or you could delve into the filersystem stuff and get the "last save time" property "last modified", "created" information

answering these questions will make it easier to help you

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