Maybe I missed it, but I didn’t notice anyone elaborate on what I think is the simplest way to handle this.

You can port your existing number to a VOIP provider (I’ve had good experience with voip.ms and Flowroute). Then you get an ATA (analog telephone adapter), connect to the VOIP service and plug your existing landline phone into it. Secure hand ATAs are pretty reasonable priced. I like the Grandstream HT802.

For learners who are helped by seeing someone think through a problem and explain why they made the choices they did it doesn’t get much better than YSAP. (Here’s the link: ysap.sh)

I like @pgo_lemmy’s answer best, but instead of rebuilding the original system, (assuming you did the default ZFS installation) you can add the bigger device as part of a mirror, let it resilver, install the boot loader, and then detach the smaller device from the mirror. It should automatically grow to the bigger size once the smaller device is removed and the only downtime you’d have is from installing the bigger device. Check the PVE wiki and you should find some details on this method.

You’ve got some good options, but let me mention that if you dig Odoo, there are alternatives to pretty much all the “Enterprise” apps. Just use the Third Party App Store or browse through the OCA (https://apps.odoo-community.org/shop).

Yeah, I sort of figured it’d be too much. It looks like there are a bunch of booking plugins for Wordpress. That’s definitely where I’d start my search in your shoes.

I’ve been using Odoo CE for some projects and I know that it has apps for scheduling and booking, but if you want to add this to an existing website, that may be overkill.

What platform does your site use? That may help target some suitable options.

Also, check out this list and you may get some ideas: https://github.com/awesome-selfhosted/awesome-selfhosted?tab=readme-ov-file#booking-and-scheduling