The number of days since a backup of the vault store was
performed.
This value is calculated from the age of the oldest item in a
pending archive state. It assumes that the Remove Safety Copies
property of the vault store in the Administration Console is set to
"After Backup". If Remove Safety Copies is set to another value you
need to interpret the value of "Days Since Last Backup"
accordingly. For example, if Remove Safety Copies is set to "After
backup (immediate for journaling)" or "Immediate", the value is
typically always 0.
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