I have always backed up using the additional -hash parameter.
I just thought this was just a better method of detecting if a file has changed or not - if a hash of a file has changed back it up. But it doesn’t appear to work like that.
If you include the -hash parameter all the files are output to the log as if they are all processed when backing up not just the ones that have changed.
However, if you do not specify the -hash parameter the logs indicate only the files that have date/size changed are included in the backup.
Can anyone give a quick explanation of what is happening and when you should or shouldn’t be using -hash?
(For my particular data set, the daily backup on average using -hash is double the amount of storage space so not an insignificant amount)