Great plug-in...it seems to be working fine. But I'm getting an "error message":
Backup warning on 2011-10-14 at 11:14:38: file 'uploads.zip' exceeds 40 percent of your PHP memory limit. The limit must be increased to back up this file.
It still appears to complete (the backup)- but is this a problem? I downloaded the TPC Memory Usage plug in...and it says my PHP Memory Limit is 128MB (plenty enough) and my wordpress memory limit is 32MB. Is this Ok? I'm still not sure what it should be, if it needs to be changed at all...or how to change it.