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It is important to keep in mind is that some kind of backup is better than no backup whatsoever, so even if you can't implement a comprehensive solution, that is ok, just do what you can.
I recommend the 3-2-1 backup strategy
- 3 copies of the data
- 2 of which are on different devices
- 1 of the 3 copies existing at a different geographical location
Why different devices? if you had two copies of the data on a single SSD, then the SSD itself becomes a single point of failure. If your second device is simply a USB Drive, it may also be a good idea to not leave it plugged in 24/7. If malware such as ransomware gets on the machine, then both copies of the data would get encrypted.
Finally the different geographical locations counters natural disasters or robbery situations. this can of course mean a cloud storage provider but it doesn't have to, You could be something as simple as a 2nd USB Drive you leave at a family members house
Whatever you end up doing, keep it simple, if your backup strategy has a lot of friction then you wont want to do it
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kura_bot
Now for my soapbox. I am not really a fan of image backups, the kind of solution that saves a copy of the entire OS in its currently installed state. Since you would still have to install software updates after restoration, I feel like the argument for restoration speed of this method is slightly overvalued.
I prefer to just backup important files, this is inconvenient at time of restoration yes, but I think the smaller backup sizes and subsequently the faster syncs are worth it. this also alleviates the need of specialized backup software, as even a simple copy and paste is enough.
For my setup, I have around ~200MB of important files, configuration files, and notes in a password protected archive, and I store said archive on Google Drive and my Nextcloud server