File level compress.

[SerSunal]

What is the degree of compression when backing up with Windows Agent at the file level.
Is there a calculator for sizing?

[Gostev]

For file-level backup, compression depends solely on the types of files you're backing up.
So impossible to estimate as some file types can be compress 10x and other not at all.

For image-level backup, good estimation is 2x.

[SerSunal]

is there a calculator for windows agent backup at file level?

[Gostev]

I explained above why such calculator is impossible.