How does RSYNC "verify" integrity of a backup???

ewok wrote:

winger wrote: Do you know the answer to my question above (when using the FrontView RSync), which is: .... Will even the slightest corruption result in a file size difference that can/will be detected by the Rsync process? The answer is no. Consider, for example, the transfer of a text file that contains "hello world". If the file gets corrupted such that the file now contains "hallo wurld", the filesize and timestamp would still be the same. The best you could do without opening up the ReadyNAS would probably be to run checksumming software from your PC, but that would involve a lot of network traffic. An interesting idea for an addon would be one that does an md5sum on every file in the data volume and makes the output available.

I wonder what checksum freefilesync uses. I just completed freefilesync checks on over 800+ GB of data (this took a few days!), and only two files were found to be different. I simply re-copied (teracopy) those two back files to the NAS and used freefilesync to re-check.