Best backup strategy for cloud based Lightroom CC

I agree with Jim. It would be useful if images deleted from the cloud could be available for restoration for 30 days like Apple’s iCloud.

I usually make a manual copy of every photo right after import. So at least I have the original, even if the editing work is accidentally deleted with the cloud version.

For that reason I don’t use the preference to store a copy locally as I can always get one on the fly for local editing. The default cache for me is much more efficient than storing every local copy as it is cleared dynamically from time to time.

In theory, the only thing you'd need your own backups for would be to protect against user error, specifically deleting images from the cloud unintentionally. There is not yet a "cloud trash can", so any deletions are permanent. Even using the "store a copy of all originals" option is no guarantee of safety because those local originals are still managed by LRCC....so if you delete an image from the cloud, the local copy becomes eligible for deletion as well. That might not happen immediately, but there's no guarantee it'll still be there by the time you realise your mistake. So in the absence of a cloud trash can, a separate backup of your images would be sensible.

There's little point in backing up the local library, if that get's wiped out by your local "catastrophic event", simply starting LRCC again will recreate it from the cloud.

LR Classic has the option for catalog backup (not image backup), but that still has to be actioned by the user, there's nothing automatic about it.