Pop up Error screen after starting backup

I have had this twice over the last few days, just minutes after starting a site backup, this is only a small portion of the screen?

Does anyone know what’s causing it? The backup has not moved for 15 minutes?

I attach a log file for your attention?

Thanks

����v۶�8�w�V�Qv#iW���r>�֦ͭ�����iS$%ѡH��|I��:Oq�:�r��<ə$(Qe;i�����-�2�`0������x��M⩻�’��\��K���*���E��a�4�� ڭ������a�C�������j4���ԕ�
ˊ’N��”���v��8Z�f���.�s�/��]&+��@��u/�Sb��mX�gj�3’F�q������]�ɞ1���S�>�0.1��bۃbg�ݷ�SǴ5�Rc��Ď�j�i�v��@\���B�헂�9�]b@�����X��q�|�՛�Uo<4̏jI�i��Mm/�̆�T�z0 ʭ��鶦��}����3܋�1#6���A����m��:;rb����lx!�h�>@���"3t����"�����qj������Y�ٻ�l��/ը���g��>�e��gƎ�U����,�X��=v�.�s8���b’v�����f���?�,v��v���c��w흽�=�=��ِ�/v<��k’�g��f�l�;N�T��3=;�]�?ӝX;�B#�4S��-[�>�}`�^ǯ�?��o����m?���^7��n��_�C�����t�;�����’g�^��������÷�4���?�����wb���_C���o>k����s���oo������?z�:|�����>z�|�b�����/v���}��Ç�’�_�9;�}꺿}r�~���r’�Ͻ睷����M�a�0~�8?;u���n���������<z��u��
ۿ�������������+R�p�}6�}����m�f�������!g/<�=z�:zSo�-!)*[C�Ǒ��AJ�sK)9&a�”��L�u{of�-����}���V��������Y��au�]�zqx>~��o C����t�
��@3�����f��8��pf(A�
t���IDh�Fz�p���AL�Q”��\�/��<.�
4����yT�Z�ơLJ��06%��C���X���$���9���1�”5�$��!V��U^2��ʘ����y�}�[�_����h�o ���,6>ڤ]aH�#P@gs�S;�AB����`�>�g0�܈�eG��.��=6m#F�Ԇ����D�W��\�=�bO]^�R&��i�y�
�q/���~�G#?DĜ)�0BJ4�^Ol3.ފ���s☴OPs�9��Yh� L�Fl����n��z�;#��m�C�����m�
�74v�ދ�;��V:����iz�;=��7���iȞ�0�V��/H���:ǿ���EН�BN��gN��b0�͆��b�l��x9�f��UYf8��:��t�0�r�06���k�83�1� �o �nZ%�a���h��6�”D�j/����<�K|��!���:Ei�X�G���M1c�f<��}uj���r5���,A�^��xSlbDlhY�ٮ����;5�
���F~����G��Qp,�.��0M��Y�����Y�Ts���lj,G� S�J�’�9�v�D�P��S��0Q��ß�J�\fA��Ŧ��g�-�덅DV�1���i!3Z���md��s0T��Z���a#�a�r����(��~���NQ��<�
-6e�Q��H����27���D���SFhm�����-u=W�XMS0��W�NJTl����X����D}hv\�ƹiy:L1j��g�~�b�§

The page I need help with: [log in to see the link]