Hi Sophie,

the limit you have set is 1 GB, so you probably have some collections
that are larger than that.

Anyway, the limit is there so that you don't attempt to transfer such
large files over the web UI. The command-line tools are not restricted
by these limitations: [1]

So you can use them to export bitstreams and continue to use the CSV
export for metadata if you wish. There's also a command-line version
of that: [2]

But your goal could also be achieved using OAI-PMH [3] [4], which got
a huge performance boost in DSpace 3.0. It can be used to prepare the
metadata in an arbitrary format [5] which can also contain links to
the bitstreams accessible via HTTP (resource policies still apply).

As you can see, there are many ways how you can export data from
DSpace, so choose what you're most convenient with.

[1] 
https://wiki.duraspace.org/display/DSDOC3x/Importing+and+Exporting+Items+via+Simple+Archive+Format#ImportingandExportingItemsviaSimpleArchiveFormat-ExportingItems
[2] 
https://wiki.duraspace.org/display/DSDOC3x/Batch+Metadata+Editing?focusedCommentId=34641195#BatchMetadataEditing-ExportFunction
[3] https://wiki.duraspace.org/display/DSDOC3x/OAI#OAI-OAI-PMHServer
[4] https://wiki.duraspace.org/display/DSDOC3x/OAI+2.0+Server
[5] 
https://wiki.duraspace.org/display/DSDOC3x/OAI+2.0+Server#OAI2.0Server-Add/RemoveMetadataFormats


Regards,
~~helix84

Compulsory reading: DSpace Mailing List Etiquette
https://wiki.duraspace.org/display/DSPACE/Mailing+List+Etiquette

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