Is it good enough just to take a daily backup?

Backups are needed not only to secure a copy of your data but to be able to revert to earlier versions for history.  So you need to manage your backups in a cycle.

So you need to keep managed backups.  Where should you keep them?  In a draw in the office?

We would say NO!!  Backup data should be kept away from the the office to ensure against fire, theft and flood.