What isn't obvious is that you have to place a minimum order of 10 licenses! So keep that in mind before going with Nakivo. Looking at pricing on Nakivo's website, you might think that you can get a perpetual license for $50/server. Read my dedicated post on how to Backup your Ubuntu Linode to your QNAP NAS with Nakivo if you go with Nakivo! (3) Nakivo Backup running on my home QNAP NAS & backing up the whole node there (NOTE! There are 2 security advisories out at the moment with regards to Nakivo Backup!) Read my dedicated post on Off-site Backup of your Ubuntu Linode with Duplicati (with MySQL, Jira, and GitLab) + Healthchecks.io if you go with Duplicati! (2) Duplicati backing up specific directories to Backblaze B2 (1) Linode's existing backup service (which I already had)
In the end I settled on a three-pronged approach:
I have no intention of paying a subscription fee for the software itself, but I don't mind paying a reasonable price for perpetually licensed software. A reliable solution, so it must be fairly popular, and it must also be efficient (compression) and fast. Must be able to back up from headless Ubuntu servers to cloud or my QNAP NAS (which is not directly accessible from the internet). If you find it useful, please leave a comment below! I'm also open to any advice. Note that none of the links here are affiliate links and I haven't received any compensation for any of this. I'm documenting my findings here mostly for myself, but I figure there must be many other devs out there who might benefit from my experiences. So, I've spent the last few days trying to identify a reliable, modern, & inexpensive solution for creating backups of these servers. There is a whole discussion on the drawbacks of Linode backups Is it just me, or is the Linode backup service about useless. It would be nice to have a central console where I can monitor all of my backups! In any case, email notifications are a must. And in any case it's good to have several indepentent backup strategies, & setting up file-level backup provides for a good opportunity to take inventory of what is worth backing up!. Restoring such backups is a pain - you have to spin up a new node & restore there, even if all you want is a file from a few days ago. If Linode goes bust or accidentally deletes my account (I've read about such cases, although I'm not sure if they were resolved) or some other unforseen event occurs then having backups with Linode is not much use. 
It is great if you have a serious issue with your whole node & need to restore it to a day ago. Of course I already pay for Linode's in-house backup solution, which is reliable & has saved me in the past. I use several Ubuntu-based VM-s hosted at Linode, which fulfill various roles (web server, JIRA, knowledgebase software). Read my dedicated post on PC backup software if that's what you're after!
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