File sync software
- Goodsync * https://www.goodsync.com/how-it-works
- Backblaze
- FreeFileSync * https://www.freefilesync.org/
- Arq * https://www.arqbackup.com/
- synctoy
- Windows 10 has a good built in file backup software suite
- rsync * rclone https://rclone.org/