Here's what the SAP-Docu says:
Since ON-Bar is not restricted by the storage device, you can select your
own storage manager (for example, Legato/Networker, HP OmniBack, IBM/ADSM)
and so exploit a wide range of intelligent and high-capacity storage deviand so
exploit a wide range of intelligent and high-capacity storage devices
(for example, auto loaders, robotic loading systems or optic disks). You
should consider using ON-Bar for databases larger than 50 GB. Due to time
and storage constraints, larger databases often require parallel backups on
fast, high-capacity media. With ON-Bar , you can easily implement fast
parallel backups and restores, so improving the availability of your
database
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