cache_views causing enormous database error

I got an installation that works online. Offline copies also worked until two weeks ago. Now the last try of a backup - I get about 10 feet length of database errors. They go away when I deactivate views via System table, so it is views causing trouble. When I re-activate Views, the same error is there. There is a lot of this:

user warning: MySQL server has gone away query: UPDATE cache_views SET data =

then it writes out the entire views cache which takes up most of the space ;)

and this

# user warning: MySQL server has gone away query: UNLOCK TABLES in F:\xampp\htdocs\Jobs\audioclassica-test\includes\database.mysql.inc on line 172.
# user warning: MySQL server has gone away query: SELECT data, created, headers, expire FROM cache_views WHERE cid = 'views_arguments:de' in F:\xampp\htdocs\Jobs\audioclassica-test\includes\database.mysql.inc on line 172.

and also this

Warning: MySQL server has gone away query: INSERT INTO watchdog (uid, type, message, severity, link, location, referer, hostname, timestamp) VALUES (0, 'php', 'MySQL server has gone away\nquery: UPDATE cache_views SET data =
but this i interpret he just wants to write error messages to watchdog table and doesn't succeed

Most of the other errors mention locales_source and locales_target, so maybe interaction with i18n (which I got also installed?)

I suspect there is something wrong with the views cache. I had trouble before when trying to import the database locally because views cache appeared to be erroneous. Can there be any relation to this issue? http://drupal.org/node/218187 cache_views is about 1MB in size.

I fear about my project, cause not being able to do a local backup - not good.

I thought about a workaround in exporting the existing views (it are not to many) and importing them in an older, working install. But there appear to be dependencies wider than that. I tried by not importing any table that has views_ in front of the name, but obviously this is not enough.