I can't think of a simple way to accomplish that. Maybe use a different type of archive media with larger capacity? Or possibly exclude files that don't need to be backed up. For instance, here's what we commonly exclude:
*.pdb
*.ncb
*.opt
*.clw
*.obj
*.pch
*.ilk
*.projdata
*.incr
*.idb
*.lib
*.exp
*.trg
*.aps
*.plg
*.scc
*.suo
/Debug
/Release
*.bak
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