Usually phpMyAdmin can handle gzipped files, but it appears yours can't. Try using one of the free gzip applications to un-zip your backup, and then upload to phpMyAdmin.

This is the message I got when I´ve tried to restore via phpmyadmin:

Database d60567888 running on MySQL Server Farm 2

There is a chance that you may have found a bug in the SQL parser. Please examine your
query closely, and check that the quotes are correct and not mis-matched. Other possible
failure causes may be that you are uploading a file with binary outside of a quoted text
area. You can also try your query on the MySQL command line interface. The MySQL server
error output below, if there is any, may also help you in diagnosing the problem. If you
still have problems or if the parser fails where the command line interface succeeds,
please reduce your SQL query input to the single query that causes problems, and submit a
bug report with the data chunk in the CUT section below:
----BEGIN CUT----
eNpzDQryD7JScDZUcDZS8HH1s1IwUDBUsDDkCg4BCstzcflWBgf6WCmY6hnoGZkk6ubkp3OFBgcp
+AfrKDi6u/qF6CiEuQJVhmfmKfj6R3n6+DiC1HIF+DpaKRjpmYCYHgEgNTr+wVYKJkARcwW3otRU
p2AXLh9HP3crhdQ83czifF0LC1NLXaC9INvkuzkYwIB5Ts9erkMGEq7fbY62nvFS2nbrzNf0gICo
grfinxsX5JraO9+7x2PXmL6b/d3EHWfvxdq0NxS/W6du0ZWiaaBzd/5L3SUTLD4cmacEAFnYSP8=
----END CUT----
----BEGIN RAW----
ERROR: C1 C2 LEN: 0 1 81
STR: 

MySQL: 5.0.24a-log
USR OS, AGENT, VER: Win MOZILLA 5.0
PMA: 2.4.0
Hi Jennifer,

Thank you for you help. I´m new with this, I´m trying to upload my first wp backup, but
it didn´t work. Here is what I´ve got:

PHP VER,OS: 4.4.7 FreeBSD
LANG: en-iso-8859-1
SQL: ‹œŒ½
Â0E÷<Å…ÌJ"¶ÚÌõgPPZpíó m5?CÞÞ>g»ÍÞ]<‡€sî®'8Šd)0,ÝŸé-¤8ðÄž"
----END RAW----
Error

SQL-query :

‹œŒ½
Â0E÷<Å…ÌJ"¶ÚÌõgPPZpíó m5?CÞÞ>g»ÍÞ]<‡€sî®'8Šd)0,ÝŸé-¤8ðÄž"
MySQL said:
You have an error in your SQL syntax; check the manual that corresponds to your MySQL
server version for the right syntax to use near '‹' at line 1
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