Get the files that are going to be patched backed up. Copy paste them in another folder.
Usually you don't know what "exact" files they are going to patch, well .. I don't.
I setup an EQLive, and EQEMu folder.
- So whenever I know its safe to patch I'll patch the eqemu folder. When I patch with the EQLive folder and find out i've fucked up because EQEMu doesn't work with latest patch, I thank god for reminding me I made an EQEMu folder.
Another sad story of darks life.