To recovery " financial information " you would need to have been using some type of Backup Software
If you have used or are using Time Machine Backup Utility you maybe able to Restore the Deleted Files
For future purposes
To truly protect your non replaceable Data
Have a 3-2-1 Rescue Plan in place and always current
3 Backups using 2 methods and 1 off site incase of natural disaster or un-natural disaster.
Each of the above should be done to a Dedicated Single Purposed External Drive
Below link is intended to augment what TM Backup does
https://bombich.com
As for the " APFS Startup Snapshot " and " I'm wondering if I might be able to recover it from there."
NO
This is technically the macOS operating system which resides in a sealed and read-only volume that can’t be opened by users or third-party applications.
You neither add nor remove anything from this Volume
