Benchmarks for other non-similar sounding backup tools

[DonaldTsang]

For reference:
https://linuxhint.com/11_best_backup_tools_linux/
https://www.tecmint.com/linux-system-backup-tools/

[DonaldTsang]

• https://github.com/borgbackup/borg
• https://github.com/backup/backup
• https://github.com/bup/bup
• https://github.com/rsnapshot/rsnapshot