What does rsync mean?Here the man page goes:rsync – faster, flexible replacement for rcp.rcp is a program that executes remote copying,and rsync is the upgrade version of it.Besides,rsync has its advantages on security and high efficiency matters.

Now,we want to backup sites(database files included) at a fixed period.You may think of ftp method,but considering the large scaling of sites source files(Bandwidth is so expensive!) and the insecurity of ftp protocal,the idea is deprecated.(About this method,link here to see it).

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