For most of those services, you’re looking at a few days to assemble and set up a server. For email, plan to spend the next month learning and troubleshooting.
You can run all of that on basically any computer. If you have an old desktop, that would work great.
Email often isn’t possible to self host because many ISPs block outbound connections on port 25. But, you can host it on some VPS providers, like DigitalOcean. The IP they give you will almost certainly have a terrible reputation and result in a lot of your mail going into people’s spam folders. So, you’ll have to spend some time contacting IP blacklist providers.
Another option is to host the inbound SMTP servers, and handle outbound through a relay server. I’m not gonna recommend any, because I’m not too familiar with them.
I know a fair bit about running email services, because I created and run https://port87.com/, a fairly new email service. I had to learn a lot about email to build it.
Some of those services are pretty easy to set up, some might be more complicated. You’d have to look around for open source projects for those services and see if you can find ones you like. It will take more time to get it initially set up than to maintain, but expect to fix something that breaks every once in a while.
As for cost, probably like a few hundred to a thousand USD can get a reasonable computer for this. You don’t need a GPU, but want a decent CPU, plenty of RAM, and a LOT of storage. Look for companies auctioning off old servers.
Loosely I’d say expect this project to be a whole hobby.
Looks like most of their services are also foss. Says their cloud service is powered by nextcloud, and pad is powered by Etherpad, upload by Lufi, etc. So, OP could probably just self-host most of these really easily. Hardest one would probably be email. That’s a whole 'nother beast for most. Especially since most residential IPs are blacklisted. You almoat always need to cloud-host that.
My cloud-hosting knowledge is a bit dated, bit I bet there are webhosting places that do the email bit for you, you juat pay the monthly fee to use their auto-gen instance of mailcow or whatever.
I mean, Email is twofold. Like running the server and getting inbound email: just as easy as all the other services.
Outbound? That shit can be difficult, near impossible on residential. But as outbound mail is kinda “lost” anyway in a privacy sense, I would not feel too bad about using a relay.
For email, you just pay for a host that will let you use your own domain. It’s usually a lot cheaper than getting a static IP and you can easily switch hosts while keeping your email address.
It’s not really even worth attempting to self host your own outbound email these days. It’s a lot of work getting the big email providers to accept your email and if someone has ever sent spam from your IP address, you are pretty much screwed.