On Sun, Dec 13, 2020 at 11:59 AM Wayne Davison via rsync < rsync@lists.samba.org> wrote:
> I should also mention that there are totally valid reasons why the dir > might be huge on day4. For instance, if someone changed the mode on the > files from 664 to 644 then the files cannot be hard-linked together even if > the file's data is unchanged. The same goes for differences in preserved > xattrs, acls, and ownership. In such a case you could decide that you > don't care about the change in meta info and tweak it on the earlier files > to match day4's files and then the suggested re-link command would decide > it could join them together. You'd probably then need to keep going and > re-link day5's pictures (since it was probably linking to the old day4's > pictures). > > ..wayne.. > I totally get why some folks would prefer to use rsync --link-dest for backups: It's very fast, and the backup itself is usable as a replacement filesystem. If you are open to trying something else though, there are probably several tools at https://stromberg.dnsalias.org/~strombrg/backshift/documentation/comparison/index.html that can backup permissions changes without needing to create a copy of the file data. Sadly, I don't know about most of the tools there, but I know that backshift wouldn't. Backshift is much slower than rsync, but also takes up quite a bit less storage space, even if you mv a large hierarchy or change all the file permissions in a hierarchy. HTH
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