Gonna keep this quick and easy, just commands and paths. If you aren’t using modern powershell swap $env:USERPROFILE for %USERPROFILE% or whatever else your software uses to get at environment variables.

This guide uses Scoop for installs, Restic for the backup internals and Resticprofile as an interface to Restic.

Installation

# Scoop
Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser
Invoke-RestMethod -Uri https://get.scoop.sh | Invoke-Expression

# Restic / Resticprofile
scoop install restic resticprofile

You should follow the instructions from scoop here if it wants you to reboot/logout

Setup

resticprofile generate --random-key > $env:USERPROFILE\AppData\Local\resticprofile\key

Put the following in $env:USERPROFILE\AppData\Local\resticprofile\profiles.toml

version = "1"

[default]
  repository = "local:Backups"
  password-file = "key"
  initialize = true

  [default.backup]
    source = [ "~/Documents/Arma 3", "~/Documents/Arma 3 - Other Profiles" ]
    check-after = true

	# If you want this to run even when you're not logged in,
	# change this to `user`, but it will prompt for admin perms.
	schedule-permission = "user_logged_on"
	schedule = "hourly"

Then,

resticprofile schedule

All done!