henganrui #1

I found that if the website exceeds half of the memory limit of the plan the backup cannot be completed. For example, the package memory is 10g, but the website has already occupied 7g. At this time, the backup needs to occupy the memory of the package, but the package memory is insufficient, which will cause the backup to fail.
There are serious risks with this, I wish the temporary memory for the backup should be a separate one, or compress the website directory directly to generate the compressed file, instead of copying it to one place first.