If you think maintaining your own backup regime is inconvenient then wait till your library is lost or corrupted… then you will know all about inconvenience.
There are far to many variables for Roon to consider a function so encompassing as backups for the music.
It’s hard enough keeping the databases backed up for most people. Roon does a great job with this part of things, even reminding when backups are not done of failed to complete.
But please take care to do your own backups for your data/music. This is not something Roon will come to the rescue with a feature as the complexities of destinations are just not going to be practical for them to consider.