I am using an iMac and my catalog size is larger than 4GB! Therefore it will not back it up. I get the message to use a 3rd Party utility such as 7-zip or StuffItExpander to extract my catalog backup. BUT!!! It Adobe doesn't tell me how to solve the problem and more importantly HOW TO DO IT!!
There is a bug in Lr- Mac Users on Backing Up: “Your Catalog Size Is Larger than 4 GB” | Laura Shoe's Lightroom Training, Tutorials and Tips
This link explains it.
It is unlikely your catalog is >4Gb anyway. (Previews probably- but not the problem)
You would only need an 'expander' program IF you have to recover from a backup (such as after a crash or corrupt catalog), AND the catalog is >4Gb, AND your OS will not extract from a zip file.
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