Readwise - Effortlessly rediscover and organize your Kindle highlights
Acronis Cyber Protect Home Office - (Formerly Acronis True Image) Complete protection for your digital life
Knotes - An efficient, beautiful Kindle highlights & notes manager
Duplicati - Free backup software to store backups online with strong encryption. Works with FTP, SSH, WebDAV, OneDrive, Amazon S3, Google Drive and many others.
Clippings.io - Organize the notes you make on your Kindle
rsync - rsync is a file transfer program for Unix systems. rsync uses the "rsync algorithm" which provides a very fast method for bringing remote files into sync.