There is no Florida Bar rule that requires a retention period of greater than six years following the conclusion of the matter.
You can always store your files electronically before you shred the actual file.
Rule 4-1.5(f)(4) requires that lawyers retain copies of executed contingent fee contracts and executed closing statements in contingent fee cases for 6 years after the execution of the closing statement in each contingent fee matter. Additionally, lawyers who are paid by insurance companies to represent insureds must retain a copy of the Statement of Insured Client’s Rights that the lawyer has certified was sent to the client for 6 years after the matter is closed.
There are some factors to consider when disposing of client files:
A lawyer should preserve, perhaps for an extended time, an index or identification of the files that the lawyer has destroyed or disposed of.
Authority to dispose of a file should be obtained from a client whenever possible, so a diligent attempt should be made to contact all clients and determine their wishes.
Absent client authority to dispose of files, an attorney should individually review files and be satisfied that no important papers of the clients are contained in the file before destruction.
You can use this link to read the full explanation and ethics opinion:
Here is a link to the Ethics Informational Packet on closed files: