Hi Michel,
It looks like no backup of your 'uploads' folder is made. The first time we see an error (that then gets repeated a lot) is this:
0017.401 (0) Beginning creation of dump of uploads
0576.982 (0) PclZip Error: PCLZIP_ERR_WRITE_OPEN_FAIL (-1) : Unable to open temporary file 'pclzip-51cea08330a60.gz' in binary write mode
Given the time interval there (560 seconds = 9 minutes 20), the most likely cause is that you run out of disk quota. If you go into the "expert options" (bottom of the UD settings page), and click on the link to count the size of the uploads folder, how big is it?
David