Really basic backups can be done using the
Windows Scheduler to run a cmd script with something like XCOPY or a powershell script to copy files to another network location. You also need to use a script to manage the archiving of the backups at the other location. You need to be aware of the potential for destroying your backups by propagating the disaster on your primary system.
You could backup to the cloud so you don't have to worry about hardware failures of the backup disks.
Alternatively, or as well as, you could get a NAS for the backups. This would allow you provide access to the backup files as a separate user from your main system. If you get an intrusion on the network they won't be able to jump straight into your backups. You run the backups scripts in the scheduler as the NAS user. If you go down this path, get one with RAID so that you have some fallback when a drive fails.
Only having Windows 10 as your server operating system does limit your capabilities compared to using Windows Server but I can see you are being given this task on a shoestring budget.
I am not sure what you know about the details of SQL backups. I'm guessing you are currently doing your backups manually using the Management Studio.
You can run a
T-SQL backup command with a script on the Scheduler. Normally a full backup is run periodically with incremental backups between them. You then copy these backup files to another location with your other backups after the SQL backup has been completed.
Read about the
Recovery Model Property of the databases to understand how the backup and recovery models work.
I assume you are using SQL Server Express (free version). It doesn't have the Agent provided in the Standard and Enterprise versions that permits advanced backup features. Be aware of this difference when you are reading about what you can do with SQL Server backups.
I work on a domain with SQL Server Standard so my knowledge of what you can do in Windows 10 with SQL Server Express is somewhat limited. We have very sophisticated (expensive) backup systems.
BTW You have been dropped into a very deep and wide pond in your new role. I suspect your employer has very little idea of the complexity of what they have asked you to do without previous experience. Try to subtly let them know it is a big task without hinting that you in over your head. Would have been easer as an assistant to someone with experience but you have what you have. Google will have to be your teacher.
This new role won't be easy at all but you have been handed a great opportunity to develop your career.