Sparse bundle in cloud?

[InfiniteLoopy]

I’d like to put some documents in an encrypted sparse bundle (created with Disk Utility in Big Sur) in iCloud Drive. I would save the password to Keychain. If I mount the bundle while it is hosted in the cloud, will it decrypt the data in the cloud, or only locally on the Mac?

I was thinking of creating a sparse disk for documents that won’t change, and a sparse bundle for documents that will. Is that a good idea?

Thanks

 

[Nigel Goodman]

I can't give a definitive answer to your decrypt in the cloud question other than to say that when I have an encrypted sparse bundle in iCloud it will not update to the cloud when it is open. Close it (e.g. eject it) it updates immediately. Which indicates to me that the decryption is local.

 

[InfiniteLoopy]

Thanks for this info.
Does anyone else know the answer?

 

[InfiniteLoopy]

Does anyone know?

 

[sdz]

all locally. Don't worry. Check package contents of sparsebundle. It is managed in encrypted 8mb chunks called "bands"

 

[Brian33]

I can't claim to know positively, but it's my understanding that all data on the storage medium stays encrypted on the medium. The reads (and writes) are decrypted/encrypted "on the fly" by your local CPU. Imagine if one had a huge encrypted disk image, and that the act of mounting it would decrypt the whole image? That could take a long time! It just wouldn't make sense to implement it that way.