Review run history with details per storage location

• Run history lists every backup run across your jobs.
• Run pages show the duration and figures for each storage location, and maintenance logs are split per storage location.
• Alert emails explain the specific reason a run failed.
• A scheduled backup that comes due while an extra copy is being made now waits for the copy to finish instead of being skipped.

Queued backups and per-location maintenance logs require agent v0.20.3 or newer.