I prefer restic for my backups. There's nothing inherently wrong with just making a copy if that is sufficient for you though. Restic will create small point in time snapshots as compared to just a file copy so I'm the event that perhaps you made a mistake and accidentally deleted something from the "live" copy and managed to propagate that to your backup it is a nonissue as you could simply restore from a previous snapshot.
These snapshots can also be compressed and deduplicated making them extremely space efficient.