Use cases

Transfer between Fedora and external preservation systems, such as APTrust, MetaArchive, LOCKSS, DPN, etc
Round-tripping resources in Fedora in support of backup/restore and Fedora version migration
1. A start has been made on this in FCREPO-1990;
2. The implementation referenced in the above ticket is not dead, though not actively being worked on at the moment; pull requests welcomed (though others may well wish to take it in a different direction).
Batch loading arbitrary sets of resources from metadata spreadsheet and binaries (may well be difficult – or not worth it – to try to generalize such a feature).

Requirements

Support recursive RDF insert/updates with LDP Indirect Container specified POST (and PUT / PATCH?) (ref: FCREPO-2042)
Supports lossless roundtripping. (ie, if you export a resource, delete that resource and import there is no difference from if you had never performed any of those operations).
1. dates must be preserved through the roundtrip
2. version snapshots must be preserved through the roundtrip
Import/Export must support transacting in Fedora-compliant RDF along with optional Binaries
Import/Export must support transacting in BagIt bags
The structure and scope of accepted and produced BagIt bags must be configurable (resource)
...