Hi,

1. Are you hosting the database? If no, then customisable databases, but do it this way default schema for base application client schema for client based customisations. . If you are hosting then the same schema setup applies.

2. DR - If you are hosting there are a multitude (2) of DR options available to you:

mirroring

log shipping

3. Recovering to point in time for a single client on a shared database-

Daily database backups and hourly transaction log backups

Restore the database to a new database and location.

Backup production DB.

Copy data from new DB to Prod for client only.

Hope this helps.

Cheers

Jamie