Then how do you explain this email sent by yourself?
We are announcing an extended, off-peak maintenance window for your backup account.
Beginning Saturday March 5th at 9:00a PT (UTC -8) the server will go offline for approx. 6 hours as we perform data integrity checks and rebalancing.
...
That's a single, one-off maintenance planned for Sat. March 5.
That is not a regular, every Saturday maintenance ... perhaps the word "Beginning" made that confusing ?
Let me check with engineering folks and see if they plan on repeating it - but even if they do, it is not a regular maintenance and you should expect your account to have long, uninterrupted uptimes ...
Is it possible to make your service highly available? Seems that is table stakes for other cloud storage services today.