Update java stack - file trans

Hello, I am going to update the java stack through the JSPM, I pasted the java's files in (usr/sap/trans/EPS/in, I have checked the file size is the 98 % used space .

My question is :

1.- Is necessary more space in the file ..usr/sap /trans to update the java ?

2.- if I will need space in /usr/sap/trans Can I get the backup of data and cofile's folders before to delete the folders's content and restore this files before that java update finishes?

Regards

DS