Regular Dropbox is where you move files into the Dropbox folder and it auto-syncs to all your computers and stores version history online (30/180 days depending

Regular Dropbox is where you move files into the Dropbox folder and it auto-syncs to all your computers and stores version history online (30/180 days depending on plan). Versions of the file in your version history don't count against your storage quota. Backups would let you back up other folders on your PC, plus it won't auto sync to other PCs meaning you save bandwidth and disk space and the version history will be oriented towards backups, i.e. it doesn't expire, deleting the local copy doesn't delete the backup, and it isn't super frequent.