"Tar: Error exit delayed previous errors"

[Erik Fleischer]

"Tar: Error exit delayed previous errors"

Could anyone tell me what this error message is supposed to mean? I 
get it every time I try the command "tar -cvf /dev/ht0 /". Someone 
has said it might have something to do with the tar command trying to 
backup the proc directory. Fine, but how can I backup my whole system 
except the proc directory with a single command?
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Erik Fleischer <[EMAIL PROTECTED]>