Backstrom's contract wouldn't come off a year early. It expires this summer.
The following players are UFAs this summer (salary cap hits in parentheses):
Backstrom ($9.2M)
Mangiapane ($5.8M)
Oshie ($5.75M)
Eller ($2.45M)
Beauvillier ($1.25M)
Raddysh ($1.0M)
Bear ($912,500)
And Alexeyev ($825,000) is an RFA.
After next season, the pending UFAs are Ovechkin, Milano, Duhaime, Frank, Carlson, and Van Riemsdyk.
None of the above counts players currently assigned to Hershey with the exception of Ethan Bear. I would say the most notable pending name in Hershey is Hendrix Lapierre, who will be an RFA this offseason.