You can link the Garmin data from connect to apple health. For me the biggest question that I had to answer was did I want a smart watch or a sports watch.
i've done this in the past for some friends, not sure if this will meet your needs, but one of the easiest and the one they liked was a program called makemkv. the ripped everything to a hard drive, then we threw those files onto a server that streams the videos accordingly. those servers...
if your number of 100gb is not a missprint, pick up a few of these and make 2 copies
https://www.bhphotovideo.com/c/product/1730627-REG/sandisk_sdssde30_1t00_g25_e30_1tb_portable_ssd.html
I have to believe that they have something network wise set up incorrectly. Doesnt make sense that a webpage getting 140Kish (?) hits a month would throttle users.