The diskette is a symbol of the abandonment of past media. Additionally, it also symbolizes old information which is transferred over. The diskette in dreams could be showing issues with unwanted data, and needing to move onto newer more relevant questions.
In recurring dreams there are often analogies someone is wrestling with. In cases where people experience dark scenarios it could be unresolved feelings around the loss of data. The drives that contain the archived version may also have a connotation of fear or anxiety due to not being able to find a way to resolve these emotions.
The diskette in the dream could be a symbol for family history and familial responsibility. The dreamer could be attempting to transfer this information onto a card or digital platform in a graveyard memorial so that future generations preserve continuity altogether.