Librenix: Scripting: A Parallel Linux Backup Script

“This example bash shell script demonstrates a simple method of
creating backups of multiple filesystems to multiple tape devices
simultaneously. While the script presented writes to four tape
drives in parallel, it can easily be modified to write to other
device types and to create a different number of backup streams.
The script is set up for the bash shell under Linux, but modifying
it for another variety of Unix should simply be a matter of
changing the locations of utility files such as tar, echo, cp, and
sleep…”

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