Hi Sebastien,Thanks for your report. It's a bit hard to debug without more information, but it sounds like a bug that should be reported upstream. Could you fill a bug at https://github.com/restic/restic/issues following the "Bug report" template?
Did you check your quota or settings on Backblaze?You can use "DEBUG_LOG=/tmp/restic-debug.log restic backup ..." to get some (hopefully) useful data.
Regards, -- Félix
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