As long as it's a backup from the same time, it should be OK

Ok thanks, is it sufficient to backup mongo and elastic independently or do they need to be backed up in a synchronized fashion?

Redis is indeed transient and backing it up is not mandatory

Hi @<1585441130525233152:profile|TrickyGoose45> , ES is actually much more instrumental to the ClearML Server, as it's used to index all reported metrics (experiments as well), so backing it up is absolutely required

Been perusing the code - it seems like ES is only used to log some queue metrics (how long the queue was and the avg wait time) and some event metrics. So I would not consider that information that needs to be restored.
On that note task_bll.py creates an events_es instance but nothing ever seems to use it. Same for the redis instance.