Everything is negotiable, but getting tapes in a timely manner from a tape vaulting service is a tough one. What if you have a disaster with a broad geographical footprint? Think Hurricane Katrina, Loma Prieta earthquake or 9/11: Retrieving data can be hampered by the collateral effects of disaster.
Your best SLA will be obtained through a two-stage process. Make two safety copies of data and store one in an onsite location (preferably a fireproof, waterproof safe or a room with proper environmental conditions and fire detection and suppression systems), and the other copy offsite with a tape vaulting provider. That covers most scenarios.
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