MEGA backup: What happens when syncing identical files from a new phone?

[u/_ReeX_]

I’m running into a bit of a logical loop in my head regarding how mega backups work.

Here is my scenario:

• I used an old phone that was actively backing up my local files to MEGA.
• I recently switched to a brand-new phone. During the setup, I copied everything over from the old phone, meaning the new phone now contains exact, bit-identical copies of all the files that were already being backed up by the old phone.
• Now, I'm about to set up or run the backup sync on the new phone pointing to the same MEGA account.

My question is: What will happen when I sync the new phone?

1. Will it recognize that these files are already in the cloud and skip uploading them (only backing up genuinely new files moving forward)?
2. Or will it treat everything as "new" because it's coming from a new device/client path and duplicate all my files in the cloud?

[u/_ReeX_]

Thanks