My external hard drive will not mount with my mac?

Okay so everything was working out great till the new OS came out. Then i ran into some problems. I can no longer back up anything i have on my laptop anymore because my external will not pick up in finder-desktop-etc. I need help as fast as i can because i need to back up, its been 50 days and my computer is filled with pricless photos and videos that i would like to save.
Please help!!!!

No it does not, sorry that this responds took so long

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