Rsync everything besides media to a Storj free account. I also rsync my most important data(docker compose files,config files, home assistant, a few small databases) to Google drive.

I use kup to back up my important PC files (the basic pre-installed backup software on KDE neon), which backs up to a separate drive on my PC, and that gets synced to my Nextcloud instance on my local server, and that - along with all the other data for my containers running on it - gets backed up by Kopia to DigitalOcean spaces.

I couldn't recommend Kopia strongly enough, because you have such fine control of what gets backed up, when it gets backed up, how many to keep etc. and it is versioned so doesn't grow exponentially, and it compresses and encrypts the backup. I also have a setup where it executes a script before and after the backup starts that stops and starts the containers to maintain file integrity since nothing will be writing to the files. And it's also a Docker container so it can just fit into your current compose setup.

All systems backup to Synology then to AWS Glacier. Ill check out Backblaze for pricing.

my solution is syncthing

I have an old synology DS1513+

it runs Active Backup for business and Active backup for google workspace, as well as an AFP share for Apple machines. This is about 95% of all backups. Those backup archive files are then ALSO backed up to one of two large 14TB hdds. I swap them out monthly (or thereabout) and keep the spare at my office or in my firesafe when at home.

I have a couple other things out there too. A small SSh box to handle some scripting of config file backups etc. My main synology 1815+ also has a cloud sync up to backblaze that happens in realtime, but only keeps 1 copy of stuff as well as a hyperbackup job for super important stuff up to Backblaze, in addition to the nightly backups to the 1513+. This way if my house burns down I still have something (and likely a full copy with the 14TB HDD)

I've been using Restic for a while, and it's backing up to a Hetzner storage box (1TB).

Restic supports encryption, compression, deduplication, and can forget old backups in a spread out timeline (configurable; e.g. save one yearly, three monthly and 7 daily).

On top of this I also use healthchecks.io to make sure all backups are working.

Rsync custom script. I am connecting two different hard disks (1 natively + 1 remotely via ssh) to backup the disk.

1 tine per month, U unplug ny microsd fro my Raspberry Pi 4 Server and I am making a full backup of the sd in case it fails, to restore it to a new sd card.

I'm running https://www.arqbackup.com/ to Storj and Synology on my desktops and plain NFS copy on my server.