Don’t worry about it - back them up. Storage has never been cheaper! Do a quick assessment of how much “stuff” you have and then buy twice that amount of external hard drive capacity (even thumbdrives and SD drives are available in sizes up to 64 gigabytes).
Then copy (don’t move!) your stuff to that drive. I bought two 3-terabyte external hard drives so that I could keep one copy offsite and one local.
Thanks, I have been doing that, anyway, but then got behind.
I guess that I’ll have to start downloading/copying everything again.