Installing and upgrading help
There is not a lot of information here, but this strikes me as a permissions issue, are you sure you are uploading to the right place? You need to talk to your host for starters, make sure you are getting it right. The other point is that shared servers have very strict space allocations, and generally do not like large web sites. It may be that a dastabase is not being allowed to be copied becuase it is too large. Talk to your hosts first though.