backing up remote files

I am trying to backup files off of a remote server using the php_ftp functions. WHat i want to know is there any way to verify that the files i download did not get corrupt in anyway. I have heard of checksums and such, but does php supports something like this? or does anyone have any ideas on a remote backup solution Marc Ray marcray@visto.com marc@holographic.com ___________________________________________________________________________ Visit http://www.visto.com/info, your free web-based communications center. Visto.com. Life on the Dot.