I use Arq to backup files on my MacBook - it saves them to my S3 bucket, so even if everyone working on Arq dies (I sincerely hope they don't!) and their server

I use Arq to backup files on my MacBook - it saves them to my S3 bucket, so even if everyone working on Arq dies (I sincerely hope they don't!) and their servers all explode, my backups are still intact on S3 - which is less likely to go down permanently and lose all my files than Tarsnap (not that that is particularly likely either!).