Hard drives will fail

• https://www.backblaze.com/blog/hard-drive-reliability-update-september-2014/

Examples some folks have had experience with

• CrashPlan

Other examples we'd like to hear others have had experience with

• https://www.backblaze.com/best-online-backup-service.html

Other resources

Mac users can especially benefit from this one-page cheat-sheet, or get the entire book:

• http://www.takecontrolbooks.com/backing-up

Guide from a vendor:

• https://www.backblaze.com/data-backup/backup-your-computer.html