Question a out a problem with Backup Pup?

Hi,
i have been having some problems with my backups after the last update.
I have been getting the following error over and over again and my backups are take ages and not completing:

[24-May-2018 21:23:38] WARNING: XML ERROR (23): EntityRef: expecting ‘;’
[24-May-2018 21:23:38] WARNING: XML ERROR (23): EntityRef: expecting ‘;’
[24-May-2018 21:23:38] WARNING: XML ERROR (23): EntityRef: expecting ‘;’

And so on….
can anyone help pls?
Many thanks for your time in advance.