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Faster backup solution?
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Yes maybe moving files could be an issue. Lot of software archives by path. rsync is one way but I suspect it is path based. If your using BTRFS I suspect the bulitin mirroring utility can track movement. Never tried though.
For backups as opposed to syncing Deja Dup, duplicity, or dupliciti are suppose to be efficient. Not sure if they are path or Inode based though for example. GNU Tar in some modes can track hard links but I do know if it can handle movement of files, I suspect no.