I temporarily stop automatic archiving in the morning while I backup the archivelogs. When I look at OEM often (and even now (my job has finished a long time ago and automatic archiving is back on), I find that there are many archiver (background processes). Can I kill them?

Why are they still running? I checked my autmatic archiving is still on. Also someone is doing an update which is not so big, I feel this might be slowing the system down, but am concerned as to what to do.

Please help,