Firebird Database Developer

Our .Net Based Software is using Firebird Database. The users of our software 1st creates Clients Masters and then in each Client Masters there are some transactions / data that belongs to that particular client. We want to implement data backup and restore facility for the selected client only [ i.e. partial backup and not the whole backup ] when we restore the data only clients that were backed up previously should be restored and rest of the data present (if any) will be unchanged. For a Practical use case scenario. Mr. ABC is running the software. The software has data of his clients i.e Mr. A's Data, Mr B's Data and Mr. C's Data. Mr. XYZ is also running the software and has Mr. X's and Mr. Y's Data Now M/s ABC takes the back up of only Mr. B's Data and he wants to restore Mr. B's data in the software of M/s XYZ. After restoring the M/s XYZ software will now show X , Y and B data. In other words Mr. ABC has exported Mr. B data and imported Mr. B data in software of Mr. XYZ