Guide for the steps to take if, when opening the backup
client, you get a message that says "Invalid byte 1 of 1-byte UTF-8
sequence".
This is caused by corruption in the .acb or .obm folder.
Open file explorer and navigate to the .acb (single user) or .obm (business user) folder in the C drive. This will be in C drive, Users, then the user folder the account runs on.
You now want to move the .acb or .obm folder out of this location - cut and paste into the desktop will be sufficient for this step.
Now log back into the backup client, it will now open as usual. Please also give the backup service a restart, a guide for that can be found here.
The .acb or .obm folder will have recreated itself in the user folder so please feel free to delete the old one.