How to examine the fast output of rsync

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http://unix.stackexchange.com – I am using rsync for backup about 100GB files and directories. My command is sudo rsync -azvv /home/path/folder1/ /home/path/folder2 However, the output for each file goes up so quickly and there are so many files, that I worry if there are some errors I cannot catch. So I wonder how you would catch any errors during backup? (HowTos)