Every time I try to BackUp on MT4.01 (was a fresh install btw, and no added plugins), I get the same error message.
All the data is processed and I get a message saying it's all backed up, then a few seconds later rather than getting the 'save to..' prompt, I get the error message:

"Specified file was not found."

I have tried differing file sizes, compression and no compression, but get the same error every time - tested on small as well as larger size blogs (small being like 10 entries, larger being around 500 entries and 1000 comments or so).

Any suggestions? My host is doing some scheduled major maintenance tomorrow and I want to get everything backed up just in case!

..using MySQL, which I have made a full backup of.
mt-check.cgi shows I have all required -and- optional modules.

looks like a session issue

have you tried to this operation from both IE and FF?

the normal behavior is that after those seconds from saying it's all backed up is to have a standard download window suggesting you the backup file name and asking you if you want to save or open the file

let me know,
Mihai Bocsaru

forgot to mention that if you have already a mysql backup that contains everything you need for a future restore

however, that doesn't exclude finding out what your issue is

Still no joy - tried both Firefox 2.0.0.11 and IE 7.0.5730.11.

additional info:
Exporting works fine btw on either browser, the issue is only with backing up.
Using Media Temple Gridserver hosting.
MT4.01 fresh install, no added plugins.
From mt-check.cgi, I have all optional modules installed, in particular
- IO::Uncompress::Gunzip installed (version 2.006).
- IO::Compress::Gzip installed (version 2.006).

Attempted (in both browsers) with each of the three archive formats (tar.gz / zip / Don't compress) with target file size 'don't divide' and had the same result every time: a message of "All the data has been backed up successfully" and then a couple of seconds wait, then instead of getting the download destination box, I get a new page in the existing browser with the message: "An error occurred ...Specified file was not found."

Then tried with smaller size files instead of 'dont divide' as follows:

Same results for each of the 2MB, 1MB, 500KB, 300KB options, and with both IE and Firefox:

- tar.gz format failed (same error)
- zip format failed (same error)
- uncompressed format gave me links to two files:
Movable_Type-2007-12-03-20-29-49-Backup-1.xml
Movable_Type-2007-12-03-20-29-49-Backup.manifest
but when I clicked on either of the links, I got the same error again in a new browser window (tab).

Under the links was the message "Requested data has been backed up successfully in the /tmp directory. Make sure that you download and then delete files listed above from /tmp immediately because backup files contain sensitive information."

I looked in the MT root, and could not locate a tmp directory, so I created one and tried again.. same problem, and nothing saved in there. As the MT installation is installed in a cgi-bin, I then tried the same thing but created the tmp directory in the root public directory, and then again in the public mt-static directory. No joy.

Where is this tmp directory supposed to be? I don't have one anywhere, and creating one in the obvious places didn't help..

Any more info I can provide?
cgi-bin directory permission 750

Yes I have the full database backed up using phpMyAdmin, but would still like to get this resolved. Perhaps is a latency issue with MediaTemple? Appreciate your help.

Try feeding MT your own temp directory by adding the TempDir configuration directive to mt-config.cgi.

Bingo! That did the trick, thank you.

Cheers