Had another friend lose a hard drive today without a proper backup.
I now have at least 3 copies of everything with staggered backups to
different hardware. For the digital signage
manage there are two copies on the servers locally and another copy in
the cloud on Amazon's S3 storage which is itself replicated multiple
The basic concept that people need to use is "SHARED NOTHING".
RAID is NOT the answer to data security, it's a convenient recovery
mechanism for failed hard drives but if your data is on two drives
connected to the same RAID controller card on the same computer in
the same room you have plenty of opportunities to lose it all.
Backups should ROTATE. Backing up to the same location risks a failure
in the backup that could wipe both copies, or copy bad data over good
before the mistake is discovered. For really critical data I have a
daily backup, a weekly backup, and a monthly backup. I also have two
backup schedules, morning that copies to one set of drives on controller
A and an evening backup that copies to a different set of drives on a
Digital Twin are an online representation of a real world object, a copy of its properties in the digital world and a way to send updated and commands to it. In effect I've been making them for years but now they have a trendy name.
Home automation systems need to respond to events in the real world. Sometimes it's an analog value, sometimes it's binary, rarely is it clean and not susceptible to problems. Let's discuss some of the ways to convert these inputs into actions.
Several years ago we did a major remodel. I did all of the finish electrical myself and supervised all of the rough-in electrical. I also put in all of the electrical system and water in our barn. I have opinions ...