Seems most of the people say they use hard link is to do incremental backup 1, but as we already have more advance backup methods such as Duplicity or rdiff-backup, so can I say it is almost useless in today environment now (from the user point of view)?
A link is a directory entry that points to blocks on disk. In other words every file on your system has at least one hard link. When you
You personally may not ever use hard links, but they are all over your system. For example:
You can see that
on some servers I use dirvish, which is a fully featured backup tool with rotating, etc. It uses hardlinks like you mentioned to create incremental backups.
The nice thing about these Backups is, that you can restore them from scratch with
For example I use this to backup my backup server (only the system) for datacenter wide bare metal recovery