Help me with rsync

[Ty Ratana]

Dear Sir/Ms,

I love your rsync command very much, but I had one problem with it.
I executed command:
rsync -e ssh -avRz  --delete /etc/
root at 192.168.110.31:/backup1/server/sol/

After that I checked the size of the backup directory and the size of
original
directory. I found that they are
different. I mean the size on the backup machine is bigger than the side
of the original
directory.

Could you please help me to give some explanation about this? How to
solve it?

Your answer would be very much appreciated!
Hope to hearing from you soon.
Thank for your effort to develop this tool.

Best regards,

Ratana