The challenges of long term archiving

Building libraries or archives is not easy :
Time consuming,
Legal issue,
Technology is a serious challenge on the long term,
The challenges in :
Acquisition
What will be archived ?
Who will submit the works and how ? (manual ? automatic ?)
Legal issue (copyright/author rights)
Archiving and long term storage/preservation
Lifetime of storage
Migration and data conversion
Periodic transfert to correct storage
Data conversion (format ?)
Emulation of software (viable ?)
Accessiblity/visibility and distribution
Interfaces (from Web to other archives) - Slow access ? Fast access ?
(re)distribution of the archived data