If I understand you correctly, you want to back up your /home so you won't lose it when you do a re-install?
If so, next time you reinstall, create a separate partition for /home and restore your backup into that partition. From then on, if you ever need to re-install, you would format only the root partition, leaving /home intact with all your settings/files. Most people create a separate /home partition for that reason.
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