It's on the tip of my tongue

[manxam]

hoarding

[JackCPickup]

Old crap

[scottalanmiller]

Junk?

[scottalanmiller]

We can do this all day.

[JackCPickup]

@scottalanmiller Sounds like a good idea

[bnrstnr]

Anybody say "legacy" yet?

[scottalanmiller]

Leftover?

[Danp]

Garbage?

Junk?

[scottalanmiller]

Silly?

[WLS-ITGuy]

Waste of space?

[scottalanmiller]

Filler?

[JaredBusch]

#opmissing

[Obsolesce]

Stale?

[nadnerB]

scum?

[nadnerB]

The forgotten

[nadnerB]

Space invaders

[nadnerB]

zombies

[nadnerB]

dead space

[computerchip]

I figured out the word I was looking for, although my definition above as I remembered it, was not correct.

Data Sprawl was the term I was looking for.

[wrx7m]

@computerchip That term wouldn't necessarily indicate the data is old/unused. It means that the data is decentralized and possibly unaccounted for.