There are several backup strategies for Aloha
AlohaEnterprise will backup your data via FTP to their servers and let you access reports via their web interface. This is a service you pay them for and if it is just a backup you want it is overkill and costs more than other options
There is a winhook.bat file that you will find in your aloha\bin folder that has dos programming for doing backups to external drives, USB or Writeable CD (some 3rd party software may be required like directCD) You may also find this being done via ecommhook.bat and/or winhook.bat depending on things like Aloha Stored Value Gift cards etc.
You can find if something like this is being executed by checking maintenance,store settings,system end of day tab for a winhook entry.
I use the winhook approach to backup to a USB thumbdrive which has been setup via windows disk managements "change driveletters and paths" so as to be accessed as a directory on my harddrive. Any data copied to this directory actually resides on the USB drive. This helps with the problem of a removable USB device changing drive letters as sometimes happens if more than one storage device is plugged in and removed from time to time.
I also use an Ibackup.com account to automatically move data off site in case of fire or other tragedy. I don't have any connection to the Ibackup people but I find their service to be world class and insanely cheap. Their lowest tier would provide space to backup MANY locations for MANY years