Riot I Need Your Help ASAP

So yesterday my league quit itself and wouldn't load, the icon would just keep bouncing(I have a mac). So i manually repaired it and it worked fine, but i lost all my item sets. Now same problem is occurring and if I fix it I lose all 53 of my item sets again. So what can I do, im not losing my item sets for a 2nd time, also i dont want to have to repair it daily. PLEASE HELP! The file keeps getting damaged
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