I have been using Restic to backup a windows machine to an external usb connected drive for a couple of years. Things have been good. I run restic in PowerShell as Administrator. Installing PowerShell by Microsoft I recommend using an exclude file because Microsoft puts much junk under various directories that you likely do not want or need to backup. I use the [–use-fs-snapshot] (Backing up — restic 0.17.2 documentation). Since my workstation has quite a few cpus I set the compression to be max. Write down your Restic password where you will be able to find it incase there is an emergency like a house fire so that you can grab the usb drive and the password. I have used restic to backup files on a previous machine and restore them all on my current machine. If you want an offsite backup then you can pay to use disks on AWS or other cloud provider.
The forum is friendly so while many users have unix / linux there are many using windows.
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