JUX One css overwrite problem

Hello,
I have made modifications to ...style.less.css.
And this file in some random period, approximately once a week are automatically overwrited. Now I have copy of this file (not like a very first time) and restoring it, but this takes some time to find.
My hosting provider has told, that they do not restore data from backup - this is a paid service.

Why this happens and how to fix ?

Hello Remigijus Barkanovas,
Thanks for choosing our product.
About your problem, I don't know what you fix in ..style.less.css. However, I think you sholdn't change code in this file. Instead, you can write css in file custom.css (If not have, you can create new file with path: dev/templates/jux_one/css)
Hope this help you.
Thanks.

Hello,
Yes, I have try to write my changes to custom.css file, as you suggest - after a week they still correct.
Seems it works,

Thanks.

Hi Remigijus Barkanovas,
I'm so happy because it worked!
Thanks.