Chunks are a main feature of Backup Chunker, and is a method of compressing thousand of files into small to medium sized compressed archives. On each synchronization, instead of re-compressing all your files, only the affected archives are re-compressed.


Assume for example that you have a folder with the following files:




Because these are important files, you want the backup of this folder to be synchronized at all times. You keep the backup on a USB removable drive, and also want the backup encrypted.


So you set up a location for the USB hard disk (the "Source & Target Locations" page), and check the selection "Use chunks". We set the average size to be 1,000,000 bytes (about 1mb)


On the first synchronization after pressing "Execute", Backup Chunker creates the following compressed files on the USB disk:




Backup Chunker has created 5 chunks. All the chunks, if they where to be extracted in the same folder, would recreate the original "My Documents" folder shown in the first screenshot above!


The next day, you add a new file Office.doc and want to synchronize again. This is how the preview will look (to preview you click the "Forward" button):




As you can see, Backup Chunker proposes to add one more zip file. After clicking "Execute", is created, which actually contains the new file.


Later you make changes to the files "Ideas.doc", "Sales.xls", and delete the file "Five-Star Brownies.txt". Here is the preview:




Notice what Backup Chunker will do when pressing "Execute": From all the archives, only (1) and (5) will be modified; the two files will be replaced in two archives 1 and 5, while one will be deleted from 5. This means that only a few archives will be re-compressed and saved to the USB disk, saving a lot of time! Imagine also that you where using a remote internet backup service instead of a USB disk - that would mean uploading just the needed chunks instead of your entire collection of files!


This is the way Backup Chunker uses chunks. If at any point you extract all archives found that look like chunk*.zip to any folder, then the original directory structure will be re-created!


Another important task is synchronizing a different location with the compressed location. Assume again that we are using a USB disk to synchronize the chunks with our computer. If we have installed Backup Chunker on our notebook also, then we can plug the USB disk in our notebook and do the following afterwards:


  • Restore the backup from the USB disk to the notebook
  • Work on our files on the notebook
  • Then back-up again from the notebook to the USB disk
  • And finally synchronize the USB disk with our main computer





For an example, this is how Backup Chunker would look running on our "Work Notebook" (see the location buttons below), after plugging in the USB drive above and synchronizing our work from the main computer:





This way we can synchronize between computers, and at the same time:


bullet Keep a backup on a removable device that is both compressed and encrypted!


bullet Each synchronization will be extremely fast, because only the necessary modifications will be executed.


bullet The backup itself will be compatible and simple to restore even without Backup Chunker, using popular compression software or windows itself, because the format used is the common zip or 7-zip compression. For a free and open-source file compressor that handles both zip and 7-zip formats, see here:


bullet You can use additional locations to hold the backup. For example, instead of using a USB key, you could use the WebDAV folders of your remote backup service! Or for extra security, synchronize to the USB key also!


bullet If you use encryption, then you can be assured that the encryption methods are safe. Especially the 7-zip format has very strong encryption (AES-256). See and for more information. Another advantage of 7-zip format is that it also encrypts the filenames of the included files.





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