I have not been able to save a backup of my CCR2004 config to the cloud for a number of days now. Every time I try I get: Server error: backend error. Is anyone else having this issue?

Yes, same problem.

same here...
from last days of 2022 i can't backup on cloud my mikrotik.
i try few mikrotik to few customers (so different ISP)...

Same issue... I guess Mikrotik hasn't set up any monitoring for this service?

Same here with my Mikrotik 33g ...

Yes, I am suffering this as well...
Would be nice to make this service more reliable. A backup that is inaccessible is of no value.