Question

In rsync what does the -avz flag mean?

Answer 1

-avz flag mean:
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-a, --archive               archive mode; equals -rlptgoD (no -H,-A,-X)
    --no-OPTION             turn off an implied OPTION (e.g. --no-D)

-v, --verbose               increase verbosity

-z, --compress              compress file data during the transfer
     --compress-level=NUM    explicitly set compression level
     --skip-compress=LIST    skip compressing files with suffix in LIST
     

recursively transfer all files from some src directory to some destination directory.