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I found an answer on StackExchange that refers to a tool called rsync-sidekick which looks like it could achieve your aims.

Edit: There is also another answer on that same StackExchange page referring to a script called rsync-prepare which is capable of working with a remote destination.

Flood/water sensors:

• Hot water heater
• Under kitchen sink
• Behind dishwasher
• Under clothes washer

Smart valve on mains water supply so you can automatically cut off water to the entire house if any of your leak sensors alert.

You could then call a friend or family member and ask them to check on it.

Or if you had it on a smart outlet you could try rebooting it.

If you live in a climate in which you need to winterize your outdoor faucets (e.g. by shutting a valve in your basement, crawlspace, or garage) a temperature sensor on the warm side of the valve can save you from a flood.

I had to replace the garage door opener one winter and failed to notice a new quarter inch gap at the bottom of the garage door. Combine that with a cold snap and the garage dropped below freezing for long enough to burst pipes.

Fortunately I had a Shelley flood sensor on the floor so I was alerted fairly early and was able to avoid serious damage, but had I been paying attention to the pipes themselves I could have avoided a plumber call-out on Christmas Eve!

The internal usb and SD card slot are just there in case you want to boot from usb or SD.

You can install your OS to them and then all of your HDDs can be used for storage instead of losing capacity to an OS partition.

Back in the day, we would look for the newest SmartStart CD to install from, but it’s no longer possible to get from official channels. Also they’re only useful for installing the supported operating systems.

The G7 knows the thermal profile of most HP hardware of it’s generation and runs the fans at the appropriate speed for proper cooling for known hardware, but sticking anything 3rd party (or just newer) in there will ramp it up to max cooling mode for thermal protection. It’s a pain.

Nothing can go wrong… go wrong… go wrong…