Backing up computer work, restoring deleted spreadsheet, initially for owners' documents (5,5)
I believe the answer is:
title deeds
'owners' documents' is the definition.
'title deeds' can be an answer for 'documents' (title deed is a kind of document). I'm not sure about the 'owners'' bit.
'backing up computer work restoring deleted spreadsheet initially' is the wordplay.
'backing' says the letters should be written backwards.
'up computer work' becomes 'it' (I can't justify this - if you can you should believe this answer much more).
'restoring' indicates an anagram (I've seen 'restore' mean this).
'initially' says to take the initial letters.
The initial letter of 'spreadsheet' is 's'.
'it' backwards is 'ti'.
'deleted' anagrammed gives 'tledeed'.
'ti'+'tledeed'+'s'='TITLE-DEEDS'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for title deeds that I've seen before include "Homely documents" , "Legal documents" , "describing the Acts of the Apostles, for example?" .)