higgsboson wrote:
Hi dataack
in case files are limited this solution may work.
In my case no. of files is very large -thousands. So checking hashes of indivisual files will be herculean task.
Thanks for suggestion.
Scripting is your friend. Then it doesn't matter if there are 20 or 20,000.
if filenames aren't there, and you have a backup with lots of files that might not be changed, then in your chosen language do something like:
Code:
hashList = Hash all know file hashes from backups
For each hash in hashList
{
If you don't know scripting you can use excel.
1. create a list of all hashes from files from the 4 month backup.
2. in sheet 1, have 2 columns, filename and hash
3. create hashes of all recovered files.
4. add the filename and hash to 2 columns in sheet 2.
5. if you can work out how to compare duplicates from each hash columns, then just do that, otherwise in sheet 3, add the hash columns from sheet 1 to column 1 and the hashes from sheet 2 to column 2 and use the duplicate find function. a bit of playing around can get you good results
if hashList[hash] == hash of rawfile
rename rawfile to hashFilename & copy to good files folder
else
copy to unknown file folder
}
otherwise, sorting from date should be easy, do the same as above, but if the hashes match, send to older than 4 month folder, and if not send to newer file folder
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] haque made it clear calculate the hash hashes that match are in his backup that do not are new [ IMHO ]