Every ProjectHut account has a fixed quota of storage assigned. The amount of storage is defined by the plan you have chosen. If you run out of disk space completely, it will not be possible to commit any more SVN revisions, nor create any new Trac tickets or WebDAV files. In addition, you may also receive errors attempting to read Trac wiki pages or tickets, as a small amount of disk space is required by the Trac database even for read-only access.
Should you run low on available disk space in your account, there are a couple of options: