Basically I killed one OS and the home folder was intact. I started using a live image over several days. When I installed a new OS all I cared about was that I had my main files. Forgot to think about the files I accumulated over a few days on the live image.
Reminds me of when I killed Windows XP by downloading questionable software and it wouldn't boot again. I tried the Knoppix live CD and was blown away. But I wasn't savvy enough then to create a persistent file that would've saved my settings and such. I bought a book about Fedora 8 shortly after that included an installable CD. It made me learn the fundamentals of Linux and Fedora proved to be quite reliable and performant. My biggest accomplishment back then was being able to install 'libdvdcss' to watch 2001: A Space Odysee on DVD.
Attach a Passport drive (at least 5Tb) to your system and create folders for specific folders for your important items. So. a LibreOffice folder with folders inside for the various document types. Maybe an ISO folder to hold your favorite ISO's, Important documents, for maybe digital copies of prior & current year Tax documents, scanned monthly bills, etc... manually move a copy of the stuff you want to backup, OR. automate it with a script...
Also, if you decide to go this route, REMEMBER, to unplug that Passport drive, BEFORE you attempt any HardDrive maintenance, using any of the Linux Tools (Gnome Disks, Disks, etc...) Misidentify, your disks, and you risk overwriting your backups.