Backing up abbrev_defs?

[Sharon Kimble]

Can some kind soul help me out please?

I want to backup my abbrev_defs file exactly the same as everything else is 
backed up, i.e. when there is a change to it, a backup is triggered to save it 
in ~/.emacs.d/backups. Although the position is slightly complicated as its not 
normally open in any buffer, so the backup would presumably have to be 
triggered on the source files changing.

I've googled but haven't found any instances of it being backed up, so there 
isn't anything seemingly available for me to hack from or with. So can some 
kind soul help with some working code, or guidance to a non-programmer to 
achieve this please?

Thanks
Sharon.
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