2. If you disable the 'Automatically upload new or modified files' option, Auto Upload will become Backup.
3. rsync over ssh is much easier to set up, more secure, but probably a little bit slower due to encryption.
4. this is just rsync's --link-dest option. Every hour you create what appears to be a full backup but every unchanged file shares the same copy as previous backups via hard links. Only the new or modified files will take up space.
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