You could create a Python script to do this. There is a library called psutil that would help. Basically,

• iterate over mounted drives and see how much each has available
• based on these values, iterate over your backup files and separate them into chunks that will fit on each drive
• copy chunks to respective drives

Would be a fun little project even for a beginner I think.

Just get the Pixel 8. Sometimes you have to pay a premium. A bird in the hand is better than a bird in the bush (a used phone you will have to find).

We need answers!