Some will let you pay for up to 10 years at the 1 year price, so if you get a deal on a particular tld (as long as it’s not an abused one like .xyz) you can pay upfront and save a decent amount of money.
From memory you should try and avoid 10 year renewals since you can’t transfer to a new registrar for the first year of the new renewal.
You’ll probably want WHOIS privacy support, so make sure the tld supports it.
I didn’t follow a guide, but this guide is probably the closest to how I’d do things.
I’d say if you don’t care that much about the data then either snapraid or RAID-5 is okay; I use snapraid because even if the data is replaceable, I’d prefer to lose only 1 or 2 drives instead of all of them. You should of course have proper 3-2-1 backups for essential/irreplaceable data in any case.
Because modern arrays are often in the multi-TB size recovery can take a significant amount of time (days and weeks potentially) and since RAID-5 only allows one drive to fail, if a second drive fails during that time you’re cooked.
I like to use snapraid combined with mergerfs which technically has the same problem, but because it works on the file level, if a second drive became corrupted, you’d only lose the data on the drive that failed, not the entire array. I combine it with snapraid-btrfs which operates on read-only snapshots instead of raw data, avoiding write hole issues (data changing during sync) and also btrfs itself on each drive gives an additional layer of integrity checking, and rollback support from the snapshots themselves.
Paperless may work for this, although it’s more focused on document scanning.
Vaultwarden is probably a better fit for password management, combined with Bitwarden app and browser extensions.
It looks similar to tailscale and netbird, in that it offers NAT traversal, relays, and proper authentication and access control. Whether or not you need that depends on your circumstances (how many users and their technical proficiency, CG-NAT prevalence, whether you need mesh support, etc).
If you’re just hosting for yourself and you have public ipv4 and ipv6 there’s not much benefit.