You would not lose files if you just install over the top. A Drive format would clean all and in that case you would have to back up what files you required to an other source.
What is the problem with your system?
Dell XPS 13 9370 (2018) review
No need to scan sketches into your computer with Moleskine's new smart pen
WWDC history: Apple's product launches since 2005
Comment importer des contacts d’un iPhone à un autre iPhone ?