[mgrohan]

資料回復 is definitely the stronger term in Taiwan. (looking on yahoo 80+% of pages are Taiwan)

In Hong Kong i hear both 數據恢復 and 資料回復 used. While i would say 資料 to refer to data by itself, in other (combination) words i would use 數據. i.e. 數據壓縮, 數據接口..

But yes, both can be used/understood.