I am using my own Mail Server (mailcow) beside my old gmail and other adresses. But for convenient, searchable offline Backups, I use Mailsteward (macOS)
... if it is of interest for someone: https://mailsteward.com
Then I put the database on multiple backup locations regularly.
Another thing, some people do not already know: If you don't need a throwaway-adress for some services, and you just want to make your mailbox more structured, you can use '+' before the '@' to add another word to your email adress.
The +randomName will be ignored and the emails are received at [email protected]. But most Servers (I use) will put a '[randomName]' before the subject of the received email. Which can be quite handy for handling your emails. Even more, if the company uses multiple different adresses to send you emails.
(alternatives for other OS: https://alternativeto.net/software/mailsteward/)
Then I put the database on multiple backup locations regularly.
Another thing, some people do not already know: If you don't need a throwaway-adress for some services, and you just want to make your mailbox more structured, you can use '+' before the '@' to add another word to your email adress.
Like: [email protected]
The +randomName will be ignored and the emails are received at [email protected]. But most Servers (I use) will put a '[randomName]' before the subject of the received email. Which can be quite handy for handling your emails. Even more, if the company uses multiple different adresses to send you emails.