Personally, I think it’s wise to have a fall back alternative, irrespective of the Roon requirement to be online, equipment breaks, drives fail, etc. etc.
Contingency Examples:
Mobile Broadband 4G Cellular Network Access Device (in case the fiber broadband dies)
Smartphone Tethering (in case the fiber broadband dies)
Audio files are accessible by a other media player (in case Roon dies)
CD player and several boxes of discs (as a last resort)
