Comments - Full Backup and Restore with Mariabackup
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it ony touched the backup directory. Note, that you can't always do the prepare on the same machine, apparently when you do not backup into a directory. You can backup to "stream" , i.e stdout, and ship that stream to another box, or elsewhere, to a cloud. Second, maybe you do not want to run an IO and CPU-expensive "prepare", on the box where a server is running.
Having said that, yes, maybe it is more convenient to run prepare on the same box right after backup, if the points above are not a concern.