I also use UrBackup with a number of clients (DietPi and Windows clients) and it is quite slow.
But this depends on network speed (like Jappe mentioned), disk speed (I used USB mounted HDDs) and the client speed itself.
For me, it works and I let run the backup like it wants to run. I don’t care for speed, because the backup does not slow down the rest of my system. So I did not invest more hours for optimizing it (which is generally bad for me as an engineer).
Q: Is the slower speed only a minor flaw or does it also limits your work in some cases?
yeah, I tried them all and get no internet connection. Already asked in armbian und debian forum, but got no solution. So Lime2-Server seem to be something for very skilled geeks. Pity that, because its a nice peace of open hardware.
Are there some other good boards to install dietpi and use full 1GB of eth instead of raspberry? Maby pine64?
If you just did not get an answer, they have no full official support, but do provide images: Olimex Lime 2 – Armbian
The “Armbian Bullseye Minimal CLI” one should be a nice starting point to use or convert into DietPi with our installer script. The Armbian images (i.e. their kernel/bootloader package composition) is well integrated into our installer since we use their package repository as well for many of our images.
More likely the kernel. That they do only offer Linux 3.4 Debian Jessie images says everything, i.e. no proper mainline kernel integration has been done, and hence the Armbian mainline-based kernel is likely to miss features.
If Ethernet is not detected, a kernel drive or device tree entry is missing or wrong, and there is little we can do about this without deep research, I’m afraid. But just to be sure it is not just some configuration issue: is the adapter listed here?
It really depends on your use case and many other factors, impossible to say generally. All SBCs provide different features, different performance have have different mainline kernel/userland support for GPU stuff and such. Generally RPi has the best maintained kernel and GUI/graphics/camera software support, but that may not be relevant for you.
I think any of the named ones (and many others) will do equally good then, as all of them have native GiB when Ethernet and USB 3 support. CPU and RAM performance AFAIK is not the limiting factor. You may prefer an SBC with integrated eMMC or eMMC slot for the OS, which is much more reliable and durable compared to an SD card, but also more expensive. RPi’s do not have it, which is one of their major weakness. But they support USB boot very well to compensate that.
In case CPU/RAM performance is relevant (as said for a backup server usually not), you may have a look at our community benchmarks: DietPi-Survey statistics