Yes, if you have anything of even moderate importance on a computer, not backing up is foolish and will eventually result in loss of data. If plugging in an ext

Yes, if you have anything of even moderate importance on a computer, not backing up is foolish and will eventually result in loss of data. If plugging in an external drive and letting something like Time Machine or Carbon Copy Cloner run from time to time is too much trouble there's even options like Backblaze which makes automated incremental backups entirely transparent and effortless. There's no good reason to not backup.