Selfhosted

For storing the backups, I use a storage VPS. I got one from HostHatch a few years ago during Black Friday sales, with 10TB space for $10/month. Hetzner have good deals with their storage boxes, too - they offer 5TB space for $13/month if you're in the USA (you need to add VAT if you're in Europe).

A good rule of thumb is to never pay more than $5/TB/month, and during Black Friday it's closer to $2/TB/month. The LowEndTalk forum has the best Black Friday deals.

I use Borgbackup for backups, and Borgmatic to handle scheduling them. Borgbackup is a fantastic piece of software.

Borgmatic has an "append only" mode which lets you configure particular SSH keys to only be able to add data to the backup, not delete it. Even if someone/something (ransomware, malicious users, etc) gains access to your system and tries to delete the backups, they can't. Essentially, this is protection against ransomware.

This is a very common issue with other backup solutions - the client has full access to the backup, so malware on the client system could potentially delete all the backups.

I have two backup copies of most things. One copy on my home server and one copy on my storage VPS. If you do do multiple backups, Borgbackup recommend doing two separate backups rather than doing one then rsyncing it to another server.

I use rsync.net

It's not the lowest price, but I like the flexibility of access.

For instance, I was able to run rclone on their servers to do a direct copy from OneDrive to rsync.net, 400Gb without having to go through my connection.

I can mount backups with sshfs if I want to, including the daily zfs snapshots.

External drives that I keep in my office at work. Also cloud storage.

Rclone to dropbox. ( was cheapest for 2tb at the time )

I use Linux, so encryption is easy with LUKS, and Free File Sync to drives that rotate to a safety deposit box at the bank for catastrophic event, such as a house fire. Usually anything from the last few months are still on my mobile devices.

I assume daily would be a bit much considering it's gonna be a few TB worth of HDDs which aren't exactly fast

What is the concern here?

I have an external storage unit a couple kilometers away and two 8TB hard drives with luks+btrfs. One of them is always in the box and after taking backups, when I feel like it, I detach the drive and bike to the box to switch. I'm currently researching btrbk for updating the backup drive on my pc automatically, it's pretty manual atm. For most scenarios the automatic btrfs snapshots on my main disks are going to be enough anyway.

I got my parents to get a NAS box, stuck it in their basement. They need to back up their stuff anyway. I put in 2 18 TB drives (mirrored BTRFS raid1) from server part deals (peeps have said that site has jacked their prices, look for alts). They only need like 4 TB at most. I made a backup samba share for myself. It’s the cheapest symbology box possible, their software to make a samba share with a quota.

I then set up a wireguard connection on an RPi, taped that to the NAS, and wireguard to the local network with a batch script. Mount the samba share and then use restic to back up my data. It works great. Restic is encrypted, I don’t have to pay for storage monthly, their electricity is cheap af, they have backups, I keep tabs on it, everyone wins.

Next step is to go the opposite way for them, but no rush on that goal, I don’t think their basement would get totaled in a fire and I don’t think their house (other than the basement) would get totaled in a flood.

If you don’t have a friend or relative to do a box-at-their-house (peeps might be enticed with reciprocal backups), restic still fits the bill. Destination is encrypted, has simple commands to check data for validity.

Rclone crypt is not good enough. Too many issues (path length limits, password “obscured” but otherwise there, file structure preserved even if names are encrypted). On a VPS I use rclone to be a pass-through for restic to backup a small amount of data to a goog drive. Works great. Just don’t fuck with the rclone crypt for major stuff.

Lastly I do use rclone crypt to upload a copy of the restic binary to the destination, as the crypt means the binary can’t be fucked with and the binary there means that is all you need to recover the data (in addition to the restic password you stored safely!).

I have two large (8 Bay) Synology NAS. They backup certain data between each other and replicate internally and push to Back blaze. $6/mo.

If you are gonna go for TrueNAS, try Storj with TrueNAS Cloud task. TrueNAS made a partnership with Storj and the price is very good. https://www.truenas.com/truecloud-backup/

TlDr; The data is encrypted with restic and sent to Storj S3 storage that is further fragmenting it (and encrypting it too - so double encryption) into multiple pieces (with redundancy) and storing on other peoples TrueNASes (you can also provide your unused space btw and gain some small money back).

I am in process of setting this up (already run a working test backup) and I didn't find anything that's better than this integrated solution. Very cool!

If you use ZFS this becomes easy, because you can do incremental backups at the block level.

I have my home lab server and do snapshots and sends to a server at my fathers house. Then I also have an external drive that I snapshot to as well.

Veeam Backup&Replication with a NFR license for me.
My personal setup:
First backup: Just a back up to a virtual drive stored on my NAS
Offsite backup: Essentially an export of what is available and then creates a full or incremental backup to an external USB drive.
I have two of those. One I keep at home in case my NAS explodes. The second is at my work place.
The off-site only contains my most important pieces of data.
As for frequency: As often as I remember to make one as it requires manual interaction.

Our clients have (depending on their size) the following setups:
2 or more endpoints (excluding exceptions):
Veeam BR Server
First backup to NAS
Second backup (copy of the first) to USB drives (min. of 3. 1 connected, 2 somewhere stored in the business, 3 at home/off-site. Daily rotation)
Optionally a S3 compatible cloud backup.

Bigger customers maybe have mirroring but we have those cases very rarely.

Edit: The backups can be encrypted at all steps (first backup or backup copys)
Edit 2: Veeam B/R is not (F)OSS but very reasonable for the free community edition. Has support for Windows, mac and Linux (some distros, only x64/x86). The NFR license can be aquired relatively easy (from here and they didn't check me in any way.
I like the software as it's very powerful and versatile. Both geared towards Fortune>500 and small shops/deployments.
And the next version will see a full linux version both as a single install and a virtual appliance.
They also have a setup for hardened repositories.

I spend my days working on a MacBook, and have several old external USB drives duplicating my important files, live, off my server (Unraid) via Resilio to my MacBook (yes I know syncthing exists, but Resilio is easier). My off-site backups are to a Hetzner Storage Box using Duplicacy which is amazing and supports encrypted snapshots (a cheap GUI alternative to Borgbackup).

So for me, Resilio and Duplicacy.

Most of my work is with Macs, and even one server is running macOS, so for those who don't know how it works 'over there', one runs Time Machine which is a versioning system keeping hourlies for a day, dailies for a week, then just weeklies after that. It accommodates using multiple disks, so I have a networked drive that services all the mac computers, and each computer also has a USB drive it connects to. Each drive usually services a couple of computers.

Backups happen automatically without interruption or drama.

I just rotate the USB drives out of the building into a storage unit once a month or so and bring the offsite drives back in to circulation. The timemachine system nags you for missing backup drives if it's been too long, which is great.

It’s not perfect but very reliable and I wish everyone had access to a similar system, it's very easy, apple got this one thing right.

My automated workflow is to package up backup sources into tars (uncompressed), and encrypt with gpg, then ship the tar.gpg off to backblaze b2 and S3 with rclone. I don't trust cloud providers so I use two just in case. I've not really been in the need for full system backups going off site, rather just the things I'd be severely hurting for if my home exploded.

But to your main questions, I like gpg because you have good options for encrypting things safely within bash/ash/sh scripting, and the encryption itself is considered strong.

And, I really like rclone because it covers the main cloud providers and wrangles everything down to an rsync-like experience which also pretty tidy for shell scripting.

I also had been contenplating this for a while. The solution I implemented recently is:

The system itself is a RPI on NixOS. The system can be reproduced from the NixOS configuration. The NixOS configuration is stored on GitHub. Since I can reproduce the sdcard image (and full system) from the configuration I opted to not do any backup of the sdcard/system itself.

I've also opted to not use raid, as I can replace/add a RPI without too much hassle.

The real backups for me are for photos. Those are stored on a M.2 storage. A second (similar) RPI is placed at my dad's place. The rpis run tailscale and syncthing. Syncthing syncs using staggered mode (stores 1 version for the last day/week/year) and the RPI at my dad is untrusted, so the backup files are sent/stored encrypted there.

This setup hasn't run very long yet, so I won't recommend it, but it seems to check quite a lot of boxes for me. Maybe it gives some ideas. I'm also interested what alternative solutions others came up with.

I built a near identical server for my parents and just sync my nextcloud folder to theirs using syncthing

My friend has 1G/1G Internet. I have a rsync cron job backing up there 2 times a week.

It has a 8TB NVMe drive that I use bulk data backup and a 2TB os drive for VM stuff.

LTO8 in box elsewhere

The price per terabyte became viable when a drive was on sale for half off at a local retailer.

Works well and it was a fun learning experience.

I have 2x 18TB HDD drives which I sync weekly and store in separate rooms.

I use Backblaze for offsite.

Look into storj and tardigrade. It's a crypto thing, but don't get scared. You back up to S3 compatible endpoints and it's super cheap (and pay with USD credit card)

I tend to just store all my backups off-site in multiple geographically distant locations, seems to work well

I use LUKS and backup to a usb-drive that I have at home. I rsync those backups to my work once a week. Not everyone can backup to their office, but as others have said, backing up to a friend/family member's house is doable. The nice thing about rsync is that you can limit the bandwidth, so that even though it takes longer, it doesn't saturate their internet connection.

I have a storage VPS and use Borg backup with Borgmatic. In my case, I have multiple systems in different repos on the remote. There are several providers, such as hetzner, borgbase, and rsync.net that offer borg storage, in the event you don't want to manage the server yourself.