How Much Faster will Duplicati be on a Newer CPU? got in that a bit indirectly, seeming to say that with a modern computer-class (as opposed to, perhaps, embedded-NAS-class) processor, something else will be the limit. I comment that it’s always something (disk, connection, etc.) but you need to find out what…
I think most or all of the programs you mention are of the more current design that tries to deduplicate, so maybe all of them will have to piece files together from blocks. The downside of minimal upload and store can be felt when it comes time to reassemble. If you find that these others solved that, please let us know.
Comments on Duplicacy are here.
Benchmarking different storage providers is even older.
As noted, if you are in a drive-loss situation, Duplicati can get going slowly unless you backed up the local database (which some people do following the main backup). Not sure which scenario you had in mind…
If you’re in a huge hurry for a post-disaster restore, some backup vendors will send a drive with your data.