I used to use Crashplan until they decided a couple of weeks ago to stop offering services to home customers.
Currently trying out BackBlaze with the 15 day trial, but yes, upload speeds seems very poor (even with 100/50 Mbps fibre).
After 7 days I have apparently only uploaded between 10 - 20 MB?
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One serious requirement I have for each and every service like this is that backups should only occur during my off-peak data times when I have 1TB available -- I don't want the service to just go nuts and upload any time of day.
The other thing that kinda irritates me about Backblaze is that yes, they basically just pick EVERYTHING on your system to back up (except system files and temporary type files). The pain I have with this is that I can't prioritize things to go first. I have documents that I want to make sure gets backed up from the start, but now it chose my random "stuff I downloaded from the internet and can likely find again" folder. Sure, if it was really fast then in a couple of days my important stuff would get uploaded, but now it doesn't seem as it it ever would.
So would probably cancel after the trial.