sql server - How to update a table from the same table in the backup? -

i want recover values table. want use table backup. how update table same table in backup?

this source

update dbcurrent.dbo.table1 curr  set curr.value1 =   (select bck.value1    dbbackup.dbo.table1 bck    bck.id = curr.id    , bck.id2 = curr.id2 ) 

how do that?

may work fine

update curr   set curr.value1 =  bck.value1  value1 curr   inner join value1 bck   on bck.id = curr.id  , bck.id2 = curr.id2