How to back up modified solİd assembly

[estoril]

Hi I have a problem Sorry my english

I delete some part of solidworks assembly and save it .There is no trouble in parts. How to back up old assembly file ? Please help me .

 

[Mike]

use 'Save as' and give it a new name, that way the original is not modified. Or to avoid accidents, make a copy of the original file before loading it into SoldWorks