Features of cloud storage - Crossword

Clues

1. Files are kept on remote servers and reached over the internet (12)
2. Rules that decide which users may open, change or share a particular document (12)
3. The process that copies changes between the cloud and every device a user owns (15)
4. Files can be reached at any time of day, every day of the year (12)
5. The ability to rent more or less space quickly as an organisation's needs change (11)
6. A level of access that lets a user view a document but not alter it (8)
7. Letting other people open or work on the same document (11)
8. Working on a local copy of a file when there is no connection (7)
9. A web address sent to one person so only they can open a file (11)
10. A spare copy of files kept by the provider in case a device fails (6)
11. Keeps a record of changes so a document can be returned to an earlier state (14)
12. Two or more people working together on the same document at the same time (13)
13. The company that owns and maintains the servers where your files are kept (13)
14. A period when the service cannot be used, often while updates are carried out (8)
15. A regular payment made to use extra cloud storage each month (12)