Better method is to set up a server w/ Syncthing and use that to just sync your Home directory remotely.
Sure, just set up a server, very convenient. Dude, this advice is for people who have never installed an operating system before.
Like, yeah, if you’re talking about keeping a living backup that is up to date within 30 seconds because you’re doing accounting as a home business and you can’t afford to lose the last 5 minutes of work, then yeah self-hosted file syncing is great. It’s absolutely a better long-term solution for personal data management. But for most people this level of backup fidelity is unnecessary, and a USB drive is a thing you can just buy and start using with no setup effort.
If you’re posting relevant, quality & especially original content then it’s not spam. If you crosspost it to a bunch of communities on the same server that’s a little spammy, so maybe don’t do that, but I don’t think it’s spammy to crosspost to similar communities on other servers.
Also consider defining the scope of your new community differently. It might be the same topic as another community, but is it more focused? more nuanced? what’s the niche you want to fill that the larger community doesn’t, or doesn’t dive deeply enough into?
And finally manage your expectations. You might have to be the sole contributor for a year or more before you start seeing active participation from other users.