Database backup

I use the database on my pc and it works fine!!!
What is the best way to save the database on another pc/onedrive so i can put it back in case of a computer/harddisk crash??
Make a new database is no option because i timed the intro’s.

Just copy the hole database file, when something goes wrong you just copy it back.
What is a cleaver idea, I was removing old files from the pc and say an old map mairlist 5 after I removed it I fond out it contains the database, and there was no backup >:(