streaming question regarding archive files

[akp geek <akpgeek@xxxxxxxxx>]

Hi all -

               We are using 9.0.4 on solaris. We set up the streaming. it is running fine. The files keep accumulating in archive directory. Do we need to keep all the files or is there a limit that , how many days worth of files we need to keep. We do take hot back up of the primary once day. 

Thanks