Reformatting my Mac

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so lately mac book pro has been running little slow , summer approaching (no school) reformat mac then. aslo adding additional ram when reformatting. how go doing this? have external hard drive mac. backup want? there "best" way backup files on computer? do after i've backed everything?

appreciated.
 

boot restore partition, open disk utility, create disk image of hard drive, save external, format, install os, migrate data disk image. best thing if os install fails or can revert disk image.
 


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