[BackupPC-users] Mac Client Setup?

>>From the current Backup PC doc:
"MacOSX

In general this should be similar to Linux/Unix machines. In versions 10.4 and later, the native MacOSX tar works, and also supports resource forks. xtar is another option, and rsync works too (although the MacOSX-supplied rsync has an extension for extended attributes that is not compatible with standard rsync)."

Can someone explain what the parenthetical _expression_ is suppose to mean? I can interpret it in the following ways:
1. The Mac OSX supplied rsync has an extension for extended attributes (what attributes specifically???) that is (should be 'are') not compatable with standard rsynch'.....and hence mac os 10.4 and greater will not work with backup pc?????

2. The Mac OSX supplied rsync has an extension for extended attributes (what attributes specifically???) that is (should be 'are') not compatable with standard rsynch'.....and hence mac os 10.4 and greater will work correctly when used with backup pc????

3. The Mac OSX supplied rsync has an extension for extended attributes (what attributes specifically???) that is (should be 'are') not compatable with standard rsynch'.....and hence mac os 10.4 and greater will work correctly when used with backup pc but will produce the following side effects...etc...

Which interpretation, if any, is correct?

Since I am not very 'Mac OS savvy' can someone annotate this description a bit by describing how to check is rsync is installed and running correctly on the Mac. It is implied that the service is installed and running by default but not clear at all.

Thanks for the clarification.

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