Copy a directory comprised of incremental backup to a separate hard disk.
When an incremental backup makes use of hardlinks, these need to be preserved when copying the backup directory. Otherwise, all files are copied individually, taking up a lot more space on the destination directory.
If copying to an external drive, it should be formatted to an ext3 or ext4 filesystem. FAT(32) formatting won’t work - it doesn’t support permission & ownership data
When rsync’ing with the
-a option, hardlinks are NOT automatically preserved:
Note that -a does not preserve hardlinks, because finding multiply-linked files is expensive. You must separately specify -H.
Hardlinks are generally a critical element of incremental backups. Hardlinks allow multiple directory/file entries to be associated with a single inode. If you do not include the rsync
-H argument, when copying a set of incrementally backed-up directories rsync would copy files in their entirety. This would lose the space saving benefits of the hardlinked incremental backup.
-aArchive mode; recursive, copy symlinks as symlinks, preserve permissions, preserve modification times, preserve group, preserve owner, preserve special & device files.
-zCompress the file data being transferred
--exclude='*.zip'do not transfer files with a
--progressprint info about the transfer (for the terminally bored, but at least you can see it’s doing something)
Note that the lack of a trailing slash on the source directory will result in this directory being created in the destination directory (if it doesn’t already exist).
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