Where do you get your music from? Like what’s the best place to download music

I have a question, Once you did this. How would we keep the backups up to date. The way I’m doing it now is literally adding new music to my main SSD then what I do is copy that Folder into my Backups by deleting pre-existing backup / music folder … and replacing it with new… the problem with this is. Every time serato will lose track of music source & I have to relocate serato to the Back up. Meaning in the case of an on site emergency. I would not be ready to dj Instantly. Is there a better way to do my music backups / keeping my music external hard drives up to date with my current source which is an ssd Please help ? I have a question, How would you keep doing this over and over? To avoid relocate using an SSd To backup ?

How can i move my music from the desktop to the internal hard drive...