rsync backup - job executed, but files not copied

I am working with KDE / Plasma 5

Here is my job description for the daily backup

Code:#!/bin/bash

#get day of week
dow=$(/usr/bin/date "+%a")

# convert DOW to lower case i.e. Mon to mon
ldow=${dow,,}

/usr/bin/rsync -av /home/alex/afolders/ /media/alex/Elements/$ldow/ >> /tmp/rsync.logthe rsync.log shows this morning the following single line

Code:sending incremental file listThe syslog file shows as if all went OK, but when I check th eindividual files that I know were changed, I discover that they were not copied, here are some examples:

Code:File type Source Destination

.xksx spreadsheet 22.3Kib - 14/09/20 22.4KiB - 8/09/20
.docx Document 168.1KiB - 13/09/20 148.8KiB - 8/09/20There is a visible change in file size and file datte stamp, why wre the files not copied?

Thanks
Alex