There would be a reliable easy to handle mass storage system like a holocube or whatever. I won't rely on burning CDs/DVDs or keeping it on HDs as they all have their limited lifespans which are not suitable for archiving.
the NIST did a study that showed that under optimal conditions a DVDR should function for 100-200 years.
Under normal storage conditions I would expect that to be at least 25-50 years.
I would consider that archival enough.