Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.
One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.
This shows the last full backup time is 7/24/2016, same as reported by Backup Exec
get-mailbox database -server 'server' -status | format-table name,storagegroup,lastfullbackup
This shows no errors with any of the writers. All are in State  Stable except for 'Microsoft Exchange Writer' and 'Shadow Copy Optimization Write' which are in State  Waiting for completion.
vssadmin list writers
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